Find the Following Limit, If It Exists $$\lim _ { x \rightarrow 3 } x ^ { 7 }$$

Find the following limit, if it exists.
$$\lim _ { x \rightarrow 3 } x ^ { 7 }$$

A) 3
B) 21
C) $- 3$
D) 2187
E) The limit does not exist.