The function $f$ is defined by $f(x)=A(B^{2x}+B^{2C})$, where $A,B,C$ are positive constants. The functions $g$ and $h$ are equivalent to function $f$, where $K$ and $M$ are constants.
$g(x)=A\cdot B^{2x}+K$
$h(x)=A(B^{2x}+M)$
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?