Explanation:

This question requires understanding what constitutes a 'processor manufacturer' in the context of the technology industry. \nLet's analyze each option:\nOption (A) **Nvidia**: Nvidia is primarily known for designing and selling Graphics Processing Units (GPUs), which are a type of processor. They also produce System-on-Chips (SoCs) like the Tegra series, which integrate CPUs and GPUs. Therefore, Nvidia is a processor manufacturer.\nOption (B) **AMD (Advanced Micro Devices)**: AMD is a major designer and vendor of both Central Processing Units (CPUs) and Graphics Processing Units (GPUs). They are a direct competitor to Intel in CPUs and Nvidia in GPUs. Therefore, AMD is a processor manufacturer.\nOption (C) **Qualcomm**: Qualcomm is a leading global designer and manufacturer of chipsets for mobile devices, including their Snapdragon series of System-on-Chips (SoCs), which integrate CPUs, GPUs, modems, and other components. Therefore, Qualcomm is a processor manufacturer.\nOption (D) **Apple**: Apple designs its own custom processors (e.g., A-series for iPhones/iPads, M-series for Macs) which are based on the ARM architecture. However, Apple does not *fabricate* these chips in its own foundries. Instead, it outsources the actual manufacturing (fabrication) to companies like TSMC. While Apple *designs* processors, its primary business is consumer electronics, and it relies on third-party foundries for the physical production. In the context of companies whose primary business is the manufacturing and sale of processors as a core product line to a broad market, Apple is typically not categorized in the same way as Intel, AMD, Nvidia, or Qualcomm. Therefore, Apple is generally considered a *designer* of processors, but not a *manufacturer* in the sense of owning fabrication plants or selling processors as a standalone product to other companies. \nTherefore, the correct option is (D).