A null entry in the busy list occurs when a memory block between two other busy memory blocks is returned to the free list.

Name: A null entry in the busy list occurs when a memory block between two other busy memory blocks is returned to the free list.
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When a memory block is returned to the free list, it means that it is no longer busy or currently in use. In this case, there would be a gap or null entry in the busy list between two other busy memory blocks.

A Null Entry in the Busy List Occurs When a Memory