Find the Values of X Such That the Vectors $\{ 2 x , x , 3 \}$

Multiple Choice

Find the values of x such that the vectors $\{ 2 x , x , 3 \}$ and $\{ 6 , x , 9 \}$ are orthogonal.

A) $x = 9 , x = - 9$
B) $x = 3 , x = 9$
C) $x = 3 , x = - 3$
D) $x = - 3 , x = - 9$
E) $x = - 3 , x = 9$