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The statement, (a . b =0) to ( a = 0 or ...

The statement, `(a . b =0) to ( a = 0 or b = 0)` where a and b are real numbers means

A

`a = 0 or b =0` is a necessary condition for `a . b = 0

B

If ` a . b ne then `a = 0 or b = 0

C

If `a ne 0` and `b ne 0` then ` a . b=0

D

None of these

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A
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