Q1. A single-bus structure is primarily found in:
A Mainframes
B Supercomputers
C High-performance machines
D Mini and micro computers Correct
Explanation
A single-bus structure uses one common communication path for the processor, memory and input-output units. This simpler and cheaper organisation is mainly associated with mini and micro computers, where cost and compact design matter more than very high parallel throughput. Mainframes usually need more elaborate channels and input-output subsystems. Supercomputers and other high-performance machines rely on wider, faster and often multiple interconnection paths to support heavy computation and large data movement. Therefore, the printed answer rightly points to mini and micro computers.