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

Multiple Choice

The values of m for which $y = x ^ { m }$ is a solution of $x ^ { 2 } y ^ { \prime \prime } - 7 x y ^ { \prime } + 12 y = 0$ are

A) $- 3$ and 4
B) $- 2$ and $- 6$
C) 3 and 4
D) 2 and 6
E) 3 and $- 4$