Find $g \circ f$ And the Domain of the Composite Function $f ( x ) = x ^ { 2 } + 4 , g ( x ) = \sqrt { x }$

Multiple Choice

Find $g \circ f$ and the domain of the composite function.
$f ( x ) = x ^ { 2 } + 4 , g ( x ) = \sqrt { x }$

A) $( x + 4 ) ^ { 4 }$ Domain of $g \circ f$ : all real numbers x
B) $( x - 4 ) ^ { 4 }$ Domain of $g \circ f$ : all real numbers x
C) $\sqrt { x ^ { 2 } + 4 }$ Domain of $g \circ f$ : all real numbers x
D) $\sqrt { ( x - 4 ) ^ { 4 } }$ Domain of $g \circ f$ : all real numbers x
E) $\sqrt { ( x + 4 ) ^ { 4 } }$ Domain of $g \circ f$ : all real numbers x