In a file allocation system, which of the following allocation

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In a file allocation system, which of the following allocation scheme(s) can be used if no external fragmentation is allowed?
I. Contiguous
II. Linked
III. Indexed

1. I and III only
2. II only
3. III only
4. II and III only

Correct Option: D

Contiguous allocation suffer from external fragmentation. But linked and indexed allocations are non-contigous, so they will not suffer from external fragmentation. Hence, option (d) is correct.