Assertion : If dot product and cross product of \[\vec{A}\] and \[\vec{B}\] are zero, it implies that one of the vector \[\vec{A}\] and \[\vec{B}\] must be a null vector. Reason : Null vector is a vector with zero magnitude.

• A.        If both assertion and reason are true and the reason is the correct explanation of the assertion.
• B.        If both assertion and reason are true but reason is not the correct explanation of the assertion.
• C.        If assertion is true but reason is false.
• D.        If the assertion and reason both are false.
• E.        If assertion is false but reason is true.