Express the Rule in Function Notation $5$ , Then Take the Square Root

Multiple Choice

Express the rule in function notation.
Square, subtract $5$ , then take the square root.

A)
$f ( x ) = \sqrt { x ^ { 2 } - 5 }$
B)
$f ( x ) = x - \sqrt { 5 }$
C)
$f ( x ) = x ^ { 2 } - 5$
D)
$f ( x ) = \sqrt { 5 x ^ { 2 } }$
E)
$f ( x ) = \sqrt { - 5 x ^ { 2 } }$