Which of the Following Is a Solution of the Differential $\frac { d ^ { 2 } y } { d x ^ { 2 } } - 6 \frac { d y } { d x } + 9 y = 0$

Which of the following is a solution of the differential equation $\frac { d ^ { 2 } y } { d x ^ { 2 } } - 6 \frac { d y } { d x } + 9 y = 0$

A) $y = e ^ { - 3 x }$
B) $y = e ^ { 2 x }$
C) $y = x e ^ { - 3 x }$
D) $y = x e ^ { 3 x }$
E) $y = e ^ { - 2 x }$
F) $y = e ^ { - 3 x } + x$
G) $y = x e ^ { 3 x } + x$
H) None of these

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