Provide an Appropriate Response $\mathrm { f } ( \mathrm { x } ) = \mathrm { a } ^ { \mathrm { x } }$

Multiple Choice

Provide an appropriate response.
-Give an equation of the form $\mathrm { f } ( \mathrm { x } ) = \mathrm { a } ^ { \mathrm { x } }$ to define the exponential function whose graph contains the point ( 2,9 $)$ . Assume that $a > 0$ .

A) $f ( x ) = 3 ^ { x }$
B) $f ( x ) = 27 ^ { x }$
C) $f ( x ) = 6 ^ { x }$
D) $f ( x ) = 8 ^ { x }$