Indexed/grouped allocation is useful as :
(A) It supports both sequential and direct access.
(B) Entire block is available for data.
(C) It does not require lots of space for keeping pointers.
(D) No external fragmentation.
Pick an option to check yourself, or open the answer below.
Show answer & explanation
Correct answer: D. (A), (B) and (D) Only
Explanation
Indexed allocation supports sequential and direct access, keeps pointers in a separate index block so each data block is fully usable, and has no external fragmentation. Its drawback is the space overhead of the index blocks, so C is not an advantage.
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