The Indicial Equation for the Differential Equation $x y ^ { \prime \prime } + 2 y ^ { \prime } - x y = 0$

Multiple Choice

The indicial equation for the differential equation $x y ^ { \prime \prime } + 2 y ^ { \prime } - x y = 0$ is

A) $r ( r - 1 ) = 0$
B) $r ( r + 2 ) = 0$
C) $r ( 2 r + 1 ) = 0$
D) $r ( 2 r - 1 ) = 0$
E) $r ( r + 1 ) = 0$