Write this expression in java

double $z=2**x+\frac{3}{?}$ Math.pow $(4,d)$;

None of the other answers

double $z=2^{**}x+\frac{3}{?}$ Math.pow $(d,4)$;

int $z=2^{**}x+\frac{3}{?}$ Math.pow $(d,4)$;

double $z=2^{**}x+\frac{3}{d^{**}}{d}^{**}{d}^{**}d$;