Mashaal Masha
If $x^{2}=a+b$ and $y^{2}=a+c$ which of the following is equal to $(x^{2}-y^{2})^{2}$?
Difficulty: Medium
A: 

$a^{2}-2ac+c^{2}$

B: 

$b^{2}-2bc+c^{2}$

C: 

$4a^{2}-4abc+c^{2}$

D: 

$4a^{2}-2abc+b^{2}c^{2}$

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