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If pi(1) and pi(2) be two planes determi...

If `pi_(1)` and `pi_(2)` be two planes determined by the pairs of vectors `vec a, vec b` and `vec c, vec d` respectively. If the planes `pi_(1)` and `pi_(2)` are parallels then

A

`(vec a xx vec c)xx(vec b xx vec d) = vec O`

B

`(vec a xx vec c) xx (vec b xx vec d) =0`

C

`(vec a xx vec b ) xx (vec c xx vec d) =0`

D

`(vec a xx vec b) xx (vec c xx vec d) = vec O`

Text Solution

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The correct Answer is:
D
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