Question 18·Hard·Nonlinear Functions

The exponential function $f$ is defined for every real number $x$ by $f(x)=cr^x$, where $c$ and $r$ are positive constants and $r>1$. The function has the properties $f(2)=32$ and $f(1)+f(3)=136$. Which choice is equal to $f(0)+f(4)$?