One mode that triple-DES can work in uses three DES operations with an encrypt/decrypt/encrypt sequence and three separate keys. What is this called?

A.
Double DES

B.
DES-EE3

C.
DES-EDE3

D.
DES-EDE2

Explanation:
Triple-DES is an extension of DES which offers much stronger
protection. It can be used a number of modes including DES-EDE3, which utilizes
three keys and an encrypt/decrypt/encrypt sequence.