If Possible, Factor the Polynomial Completely $$z ^ { 2 } - 14 z + 49$$

Multiple Choice

If possible, factor the polynomial completely. If a polynomial cannot be factored, state that it is prime.
- $$z ^ { 2 } - 14 z + 49$$

A) $( z - 7 ) ( z + 7 )$
B) $( z - 14 ) ( z + 14 )$
C) $( z - 7 ) ^ { 2 }$
D) $( z + 7 ) ^ { 2 }$