Factor Completely $$\mathrm { z } ^ { 2 } - 49$$

Multiple Choice

Factor completely. If unfactorable, indicate that the polynomial is prime.
- $$\mathrm { z } ^ { 2 } - 49$$

A) $( z + 7 ) ( z - 7 )$
B) $( z - 7 ) ^ { 2 }$
C) prime
D) $( \mathrm { z } + 7 ) ^ { 2 }$