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The non-zero vectors bar(a) , bar(b) , ...

The non-zero vectors `bar(a) , bar(b) , bar(c )` holds `| (bar(a) .bar(b) ).bar( c) |=| bar(a) ||bar(b)|| bar( c)` if

A

`bar(a).bar(b) =, bar(b).bar(c )=0`

B

`bar(b).bar(c ) =0, bar(c ).bar(a) = 0`

C

`bar(c ).bar(a) =0, bar(a).bar(b)=0`

D

`bar(a).bar(b)= bar(b).bar( c) = bar(c ).bar(a)=0`.

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The correct Answer is:
D
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