If $A$ and $B$ are square matrices of size $n \times n$ such that $A^2 - B^2 = (A - B)(A + B)$,then which of the following will be always true?
- A$A = B$
- B$AB = BA$
- CEither $A$ or $B$ is a zero matrix
- DEither $A$ or $B$ is an identity matrix
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