Provide an Appropriate Response $c$ Does the Quadratic Function $f ( x ) = x ^ { 2 } - 6 x + c$

Multiple Choice

Provide an appropriate response.
-For what value of $c$ does the quadratic function $f ( x ) = x ^ { 2 } - 6 x + c$ have exactly one $x$ -intercept?

A) 24
B) $\frac { 3 } { 2 }$
C) 9
D) $- 9$