Identify Which of the Twelve Basic Functions Listed Below Fit $y = x ^ { 2 } , y = \cos x , y = | x |$

Multiple Choice

Identify which of the twelve basic functions listed below fit the description given.
-The three functions that are even

A) $y = x ^ { 2 } , y = \cos x , y = | x |$
B) $y = x , y = x ^ { 2 } , y = x ^ { 3 }$
C) $y = x , y = \frac { 1 } { x } , y = x ^ { 3 }$
D) $y = \cos x , y = \sin x , y = | x |$