Which of the Following Functions Is a Solution of the Differential

Multiple Choice

Which of the following functions is a solution of the differential equation? $$y ^ { tt } + 16 y ^ { t } + 64 y = 0$$

A) $y = e ^ { t }$
B) $y = t e ^ { - 3 t }$
C) $y = 6 e ^ { - 3 t }$
D) $y = e ^ { - \lambda t }$
E) $y = t ^ { 2 } e ^ { - 8 t }$