Simplify the Following Expression $$4 \sqrt { 63 } + 4 \sqrt { 7 }$$

Simplify the following expression. $$4 \sqrt { 63 } + 4 \sqrt { 7 }$$

A) $8 \sqrt { 7 }$
B) $112$
C) $16 \sqrt [ 3 ] { 7 }$
D) $8 \sqrt [ 3 ] { 7 }$
E) $16 \sqrt { 7 }$