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Math·Advanced Math·Nonlinear functions

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On January 1, there were 237 views of a video posted on a social media site. Every 2 days after January 1, the number of views of the video had increased by 70% of the number of views 2 days earlier. The function $f$ gives the predicted number of views $x$ days after January 1. Which equation defines $f$?

A

$f(x)=237(0.70{)}^{\frac{x}{2}}$

B

$f(x)=237(0.70{)}^{2x}$

C

$f(x)=237(1.70{)}^{\frac{x}{2}}$

D

$f(x)=237(1.70{)}^{2x}$