What does the case statement do in the script?

View the Exhibit.

What does the case statement do in the script? (Choose two.)

A.
exits the script if 0 is supplied as the input

B.
executes like a series of if-then-else statements

C.
prints all output of all commands on standard output

D.
executes the last echo statement if 0 is supplied as the input

Explanation: