What is the form of the Difference of Squares identity ? A. a ^ 2 - b ^ 2 = (a - b)(a - b) B. a ^ 2 + b ^ 2 = (a - b)(a - b); a ^ 2 - b ^ 2 = (a + b)(a + b) O a ^ 2 - b ^ 2 = (a + b)(a - b)