Determine a Formula for the Exponential Function $f ( x ) = \frac { 5 } { 3 } \cdot 3 ^ { x }$

Multiple Choice

Determine a formula for the exponential function.
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A) $f ( x ) = \frac { 5 } { 3 } \cdot 3 ^ { x }$
B) $f ( x ) = 5 \cdot 3 ^ { - x - 1 }$
C) $f ( x ) = 5 \cdot \left( \frac { 1 } { 3 } \right) ^ { x }$
D) $f ( x ) = 5 \cdot 3 ^ { - x }$