Explanation:

The question asks about the mechanism through which data moves between the Central Processing Unit (CPU) and peripheral devices (like printers, keyboards, mice, external drives). This involves understanding how different components communicate within a computer system. Option (c) Interfaces: 'Interfaces' is the most comprehensive and accurate term. In computing, an interface is a shared boundary across which two or more separate components of a computer system exchange information. This includes both hardware interfaces (like buses, controllers, and ports) and software interfaces (like device drivers and APIs). For data transfer between the CPU and peripherals, a combination of hardware interfaces (e.g., a USB interface, a SATA interface, a PCIe interface) and their corresponding software drivers (which are part of the operating system's interface with the hardware) are used. The interface defines the rules, signals, and protocols for communication, ensuring that the CPU and the peripheral device can understand each other and exchange data correctly. A 'port' (Option B) is a physical manifestation of an interface, but the actual transfer mechanism involves the entire interface logic and protocols. Option (a) Modems: A 'modem' (modulator-demodulator) is a device that converts digital signals into analog signals for transmission over communication lines (like telephone lines or cable) and vice versa. Modems are primarily used for network communication, especially over wide area networks (WANs) or the internet. They are not the general mechanism for direct data transfer between a CPU and its locally connected peripheral devices. While a network card (which might include modem functionality for certain connections) is a peripheral, the modem itself is not the universal means of CPU-peripheral data transfer. Therefore, this option is incorrect. Option (b) Computer ports: 'Computer ports' are physical connection points on a computer where peripheral devices are plugged in (e.g., USB port, HDMI port, Ethernet port). While ports are essential for connecting peripherals, they are only the *physical entry/exit points* for data. The actual transfer of data involves more than just the port itself; it includes the underlying controller, the bus, and the communication protocols defined by the *interface*. A port is a component of the overall interface, but 'interfaces' (plural, encompassing the entire communication mechanism) is a more accurate and complete answer for how data transfer is *achieved*. If 'interfaces' were not an option, 'ports' might be considered, but 'interfaces' is superior. Option (d) Buffer memory: 'Buffer memory' is a temporary storage area used to hold data during transfer between two devices or components that operate at different speeds or have different data handling capabilities. For example, a printer might have a buffer to store data sent from the CPU before it can print it. While buffer memory is often *involved* in data transfer to ensure smooth operation and prevent data loss, it is not the *mechanism* by which the transfer itself is achieved. It facilitates the transfer but doesn't define the communication path or protocols. The transfer is achieved *through* interfaces, and sometimes *via* buffers. Therefore, this option describes a component that aids transfer, not the transfer mechanism itself.