Question

the address registers number of bits. 32 12 16 10

Explanation:

In modern computer systems, address registers typically use 32 bits (a common standard for addressing memory in many legacy and some current systems, supporting up to 4GB of addressable memory, which aligns with typical educational framing of this topic). While other bit lengths exist, 32 is the standard correct answer in most foundational computer science contexts for this question.

Answer:

A. 32