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
(A) I and III only
(B) II only
(C) III only
(D) II and III only
Answer: (D)
Explanation: In contiguous allocation there is always possibility of external fragmentation. Both indexed and linked allocation are free from external fragmentation.
See https://en.wikibooks.org/wiki/Operating_System_Design/File_Systems/Allocation for details.
Therefore, option D
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