Find the Series' Radius of Convergence $$\sum _ { n = 0 } ^ { \infty } \frac { ( x - 4 ) ^ { 2 n } } { 16 ^ { n } }$$

Find the series' radius of convergence.
- $$\sum _ { n = 0 } ^ { \infty } \frac { ( x - 4 ) ^ { 2 n } } { 16 ^ { n } }$$

A) $\infty$ , for all $x$
B) 1
C) 8
D) 4