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 $y ^ { \prime \prime } - 4 y ^ { \prime } - 5 y = 0$ are

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