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

Multiple Choice

The values of m for which $y = e ^ { xxx }$ is a solution of $y ^ { \prime \prime } - 9 y ^ { \prime } + 20 y = 0$ are

A) 4 and $- 5$
B) $- 4$ and $- 5$
C) 3 and 6
D) 4 and 5
E) 3 and 5