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Math·Advanced Math·Nonlinear functions

hard

The functions $f$ and $g$ are defined by the equations shown, where $a$ and $b$ are integer constants, $a<b$ and $b<0$. If $y=f(x)$ and $y=g(x)$ are graphed in the $xy$-plane, which of the following equations displays, as a constant or coefficient, the y-coordinate of the y-intercept of the graph of the corresponding function?
I. $f(x)=a(4.2{)}^{x+b}$
II. $g(x)=a(4.2{)}^x+b$

A

I only

B

II only

C

I and II

D

Neither I nor II