Size of the primary memory of a PC ranges between
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Answer: C) 256KB & 640KB
In older computer fundamentals textbooks, the primary memory of an early personal computer (PC) is often described as ranging from 256 KB to 640 KB. This refers to the conventional memory capacity commonly associated with early IBM-compatible PCs.
Primary memory is the memory directly accessible by the CPU, mainly RAM and ROM. RAM temporarily stores programs and data currently in use, while ROM stores essential instructions needed to start the computer.
Source: Scan #3 page 1 Q378