Rewrite the Quadratic Function in Standard Form by Completing the Square

Multiple Choice

Rewrite the quadratic function in standard form by completing the square.
- $$f ( x ) = x ^ { 2 } - 6 x + 7$$

A) $f ( x ) = ( x + 3 ) ^ { 2 } + 2$
B) $f ( x ) = ( x - 3 ) ^ { 2 } + 2$
C) $f ( x ) = ( x + 3 ) ^ { 2 } - 2$
D) $f ( x ) = ( x - 3 ) ^ { 2 } - 2$