The Solution Of $y ^ { \prime \prime } + \lambda y = 0 , y ( 0 ) = 0 , y ( \pi ) = 0$

Multiple Choice

The solution of $y ^ { \prime \prime } + \lambda y = 0 , y ( 0 ) = 0 , y ( \pi ) = 0$ if $\lambda = 0$ is

A) $y = a x + b$
B) $y = x - \pi$
C) $y = 0$
D) $y = \sin x$
E) $y = \cos x$