Multiple choice

Which of the following is not an external command?

  1. Chkdsk

  2. Scandisk

  3. Format

  4. Dir

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

DIR is an internal DOS command built into COMMAND.COM, while Chkdsk, Scandisk, and Format are all external commands that exist as separate executable files. Internal commands are always available without needing external files.