The Values of M for Which $y = e ^ { m x }$

Multiple Choice

The values of m for which $y = e ^ { m x }$ is a solution of $y ^ { \prime \prime } - 5 y ^ { \prime } + 6 y = 0$ are

A) 2 and 4
B) $- 2$ and $- 3$
C) 3 and 4
D) 2 and 3
E) 1 and 5