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Math·Advanced Math·Nonlinear functions

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For a function $f$, the value of $f(x)$ is multiplied by 9 for every increase of 1 in the value of $x$. When $x=0$, $f(x)=8$. Which of the following equations defines $f$?

A

$f(x)=9(8{)}^x$

B

$f(x)=8x+9$

C

$f(x)=8(9x)$

D

$f(x)=8(9{)}^x$