What is the name for a substitution cipher that shifts the alphabet by 13 places?

A.
Caesar cipher

B.
Polyalphabetic cipher

C.
ROT13 cipher

D.
Transposition cipher

Explanation:
ROT13 was an encryption method that is similar to Caesar cipher, but instead of shifting 3 spaces in the
alphabet it shifted 13 spaces.
Incorrect Answers:
A: Caesar cipher shifts three spaces.
B: A polyalphabetic cipher makes use of more than one alphabet.
D: Transposition cyphers moves the original values around.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 762, 774, 778