Let $z=e^{x}siny,$ and let $x$ and $y$ be functions of $s$ and $r$ with $x(0,0)=0,y(0,0)=0,$ ai $\frac{?}{i{s}^{}}=3,$ and $\frac{y}{\text{\&}}=4$ at $(s,t)=(0,0).$ Find $$ is $\frac{?}{?}$ is when $(s,f)=(0,0).$

a $7$

b$.1$

e$.6$

c$.0$

f$.3$

d$.4$

g$.5$

h$.2$