Which DOS command is used to detect, diagnose and repair logical and physical disk errors on both, uncompressed and Double space compressed drive?

The correct answer is C. SCANDISK.

SCANDISK is a DOS command used to detect, diagnose and repair logical and physical disk errors on both, uncompressed and Double space compressed drive. It can also be used to defragment a disk.

DEFRAG is a DOS command used to defragment a disk. It does not detect or repair disk errors.

DBLSPACE is a DOS command used to compress a disk. It does not detect or repair disk errors.

MSAV is a DOS command used to scan a disk for viruses. It does not detect or repair disk errors.

E is not a valid option.