Which of the following is NOT a true statement regarding the implementaton of the 3DES...

There is no DES mode call DES-EEE1. It does not exist.

The following are the correct modes for triple-DES (3DES):

DES-EEE3 uses three keys for encryption and the data is encrypted, encrypted, encrypted;

DES-EDE3 uses three keys and encrypts, decrypts and encrypts data.

DES-EEE2 and DES-EDE2 are the same as the previous modes, but the first and third operations use the same key.

Reference(s) used for this question:

Shon Harris, CISSP All In One (AIO) book, 6th edition , page 808

and

Official ISC2 Guide to the CISSP CBK, 2nd Edition (2010) , page 344-345