Which is true for two vector A = A1i + A2j + A3k and B = B1i + B2j + B3k?

• A. A.B = A1B1 + A2B2 + A3B3
• B. AxB = A1B1 + A2B2 + A3B3
• C. A.B = A1B2 + A2B3 + A3B1
• D. AxB = A1B2 + A2B3 + A3B1