Operating System (OS)
The computational technique used to compute the disk storage address of individual records is called:

None of these
key fielding
bubble memory
hashing
dynamic reallocation

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Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

they are partly in primary memory and partly on disk
they are available on magnetic tapes
they are initially stored on disk
they are memory resident
None of these

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