Condition for the sum of two vectors to be perpendicular to their difference

1. A.
   perpendicular to each other.
2. B.
   parallel to each other.
3. C.
   unequal in magnitude.
4. D.
   equal in magnitude.

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1. A.
   $|\vec{A}| = |\vec{B}|$
2. B.
   $\vec{A}\cdot\vec{B} = 0$
3. C.
   $\vec{A} \times \vec{B} = 0$
4. D.
   $\vec{A}\cdot\vec{B} = 1$

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1. A.
   perpendicular to each other
2. B.
   unequal in magnitude
3. C.
   parallel to each other
4. D.
   equal in magnitude

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