Find the Domain of the Function $f ( t ) = \sqrt { 64 - t ^ { 2 } }$

Multiple Choice

Find the domain of the function.
$f ( t ) = \sqrt { 64 - t ^ { 2 } }$

A) $- 8 \leq t \leq 8$
B) $t \leq - 8$ or $t \geq 8$
C) $t \geq 0$
D) $t \leq 8$
E) all real numbers