Which of the following is/are part of an Instruction Set Architecture of a…

Answer: The total number of registers is part of the Instruction Set Architecture (ISA).

Why:

• The ISA defines programmer-visible state and behavior, including the instruction set, data types and sizes, addressing modes, instruction formats/encodings, and the architected register set (how many registers and their roles).

Contrast with microarchitectural features:

• Cache size and the number of cache levels are implementation choices that affect performance but do not change the ISA.

• Clock frequency and pipeline depth are hardware-performance parameters, also outside the ISA.

Summary:

• Included in ISA: the total number of registers (architected register set) and other programmer-visible details.

• Not part of ISA: cache size, number of cache levels, and clock frequency (these are microarchitectural).