Provide an Appropriate Response $\mathrm { f } ( \mathrm { t } ) = \mathrm { ka } t$

Provide an appropriate response.
-Use the properties of exponents to write the function of the form $\mathrm { f } ( \mathrm { t } ) = \mathrm { ka } t$ , where $\mathrm { k }$ is a constant.
$$f ( t ) = \left( \frac { 1 } { 3 } \right) ^ { 1 - 2 t }$$

A) $f ( t ) = \frac { 1 } { 3 } \left( \frac { 1 } { 9 } \right) ^ { t }$
B) $f ( t ) = \left( \frac { 1 } { 3 } \right) 9 ^ { t }$
C) $f ( t ) = 3 \cdot 9 t$
D) $f ( t ) = \left( \frac { 1 } { 9 } \right) 3 ^ { t }$