Cameron claims that (x2 + y2)2 is equivalent to (x2 - y2)2 + (2xy)2. Which of the following statements BEST describes Cameron's claim?
A. The claim is only true when x = y = 0 since the expressions are both equal to 0 for these values
B. The claim is true for all values of x and y since (x2 + y2)2 = (x2 - y2)2 + (2xy)2 is a polynomial identity.
C. The claim is only true when x 2 y since the value of x2 - y2 is negative otherwise.
D. The claim is never true since x2 + y2 is not equivalent to x2 + 2xy - y2.