Perform the Operation and Simplify $( a - 8 ) ^ { 2 }$

Multiple Choice

Perform the operation and simplify. $( a - 8 ) ^ { 2 }$

A) $\quad a ^ { 2 } - 8 a + 64$
B) $\quad a ^ { 2 } - 16 a + 64$
C) $\quad a ^ { 2 } - 64$
D) $\quad a ^ { 2 } + 64$
E) $\quad a ^ { 2 } + 16 a + 64$