Find $d^{2} y / d x^{2}$ In Terms of X and Y

Multiple Choice

Find $d^{2} y / d x^{2}$ in terms of x and y. $x^{6}-y^{6}=1$

A) $6 x^{5}-6 y^{5}$
B) $\frac{5 x^{4}}{y^{5}}-\frac{5 x^{10}}{y^{11}}$
C) $30 x^{4}-30 y^{4}$
D) $\frac{x^{5}}{y^{5}}$