Recall the three ways a file system maps a file to disk blocks. First, put the whole file in a run of neighbouring blocks. Second, store blocks anywhere and link them with pointers. Third, gather every block address into one index block.
These are Contiguous, Linked, and Indexed. Scan the options and remove each real method. What is left is Logical Allocation, which is not a named file allocation scheme.
\[\boxed{\text{Logical Allocation}}\]
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