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 $y ^ { \prime \prime } - 6 y ^ { \prime } - 7 y = 0$ are

A) 1 and 7
B) $- 1$ and 6
C) 1 and 6
D) 1 and $- 6$
E) $- 1$ and 7