Format command is used to

Solution (By Examveda Team)

In Disk Operating System (DOS), the Format command is used to Option A: Prepare a blank disk. When you format a disk, it prepares the disk to store data by creating a file system and directory structure on it, effectively erasing any existing data.

Option B, "Create a new blank disk from a used one," is not accurate. Formatting a disk does not create a new physical disk; it prepares the existing disk for data storage.
Option C, "Both of above," is incorrect because formatting prepares a blank disk; it does not create a new disk from a used one.

Therefore, the correct answer is Option A: Prepare a blank disk.