Find the Domain Of $f ( x ) = \sqrt { 7 - x }$

Multiple Choice

Find the domain of $f ( x ) = \sqrt { 7 - x }$ .

A) all real numbers x such that $0 \leq x \leq 7$
B) all real numbers x such that $x \geq 7$
C) all real numbers x such that $x \leq 7$
D) all real numbers x such that $- 7 \leq x \leq 0$
E) all real numbers x such that $- 7 \leq x \leq 7$