The unit of memory within CPU is ............a.bitb.2 bytesc.byted.None of the others.e.wordf.4 bytes

The unit of memory within CPU is e. word.

Here's why:

The Central Processing Unit (CPU) uses a number of memory units for processing information. However, the 'word' is the fundamental unit of memory that the CPU can process at one time.

A 'word' in computing refers to the set of bits that a CPU can process at once. The size of a word varies depending on the specific CPU architecture. For instance, in a 32-bit CPU architecture, a word is 32 bits or 4 bytes. In a 64-bit CPU, a word is 64 bits or 8 bytes.

So, while bits and bytes are indeed units of digital information, the 'word' is the most relevant unit of memory within the context of CPU processing.