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The sides of a parallelogram are 2 hat i...

The sides of a parallelogram are `2 hat i+4 hat j-5 hat k` and ` hat i+2 hat j+3 hat k` . The unit vector parallel to one of the diagonals is a. `1/7(3 hat i+6 hat j-2 hat k)` b. `1/7(3 hat i-6 hat j-2 hat k)` c. `1/(sqrt(69))( hat i+6 hat j+8 hat k)` d. `1/(sqrt(69))(- hat i-2 hat j+8 hat k)`

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