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What is vector of unit length orthogonal...

What is vector of unit length orthogonal to both the vectors `hat(i) + hat(j) + hat(k) and 2hat(i) + 3hat(j) - hat(k)` ?

A

A. `(-4 hat(i) + 3hat(j) - hat(k))/(sqrt26)`

B

B. `(-4hat(i) + 3hat(j) + hat(k))/(sqrt26)`

C

C. `(-3 hat(i) + 2hat(j) - hat(k))/(sqrt14)`

D

D. `(-3hat(i) + 2hat(j) + hat(k))/(sqrt14)`

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The correct Answer is:
B
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