If (v1 + v2) is perpendicular to (v1 - v2), then which of the following are/is true? A. v1 is perpendicular to v2 B. magnitude of v1 is equal to magnitude of v2 C. v1 is a null vector D. the angle between v1 and v2 can have any value NOTE: v1 and v2 ARE VECTORS.

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