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The vectors bara" and "barb determine on...

The vectors `bara" and "barb` determine one plane and the vectors `barc" and "bard` determine another plane. If the planes are parallel, then

A

`(bara xx barc) xx (barb xx bard)=bar0`

B

`(bara xx barc). (barb xx bard)=0`

C

`(bara xx barb) xx (barc xx bard)=bar0`

D

`(bara xx barb).(barc xx bard)=0`

Text Solution

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The correct Answer is:
C
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