If a^(2)+b^(2)+c^(2)=1 then the range of...

If `a^(2)+b^(2)+c^(2)=1` then the range of `ab+bc+ca` is

A

`[1, oo)`

B

`[ (-1)/(2), oo]`

C

`(- 1/2, 1)`

D

`[ (-1)/(2), 1]`

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The correct Answer is:

D

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