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Math·Advanced Math·Equivalent expressions

hard

The function $f$ is defined by $f(x)=a(3.1^x+3.1^b)$ where $a$ and $b$ are integer constants and $0<a<b$. The functions $g$ and $h$ are equivalent to function $f$, where $k$ and $m$ are constants. Which of the following equations displays the $y$-coordinate of the $y$-intercept of the graph of $y=f(x)$ in the $xy$-plane as a constant or coefficient?

I. $g(x)=a(3.1^x+k)$
II. $h(x)=a(3.1{)}^x+m$

A

I only

B

II only

C

I and II

D

Neither I nor II