Find the Radius of Convergence of the Power Series $$\sum _ { n = 0 } ^ { \infty } \frac { ( 8 x ) ^ { 2 n } } { ( 2 n ) ! }$$

Multiple Choice

Find the radius of convergence of the power series. $$\sum _ { n = 0 } ^ { \infty } \frac { ( 8 x ) ^ { 2 n } } { ( 2 n ) ! }$$

A) $\infty$
B) 16
C) 64
D) 0
E) 8