Explanation:

The processor, often referred to as the Central Processing Unit (CPU), is primarily composed of two main functional units: the Control Unit (CU) and the Arithmetic Logic Unit (ALU). The Control Unit manages and coordinates the components of the computer system, directing the flow of data and instructions. The ALU performs all arithmetic and logical operations. Option (a) includes 'Main Memory', which is external to the CPU itself, though closely associated. Options (b), (c), and (d) list components that are either storage devices (Hard Disk, Floppy Drive), memory (Main Memory, storage), or software (Operating system, Applications), none of which are direct constituent parts of the CPU's core architecture. Thus, option (e) correctly identifies the Control Unit and ALU as the fundamental parts of a computer's processor.