If alpha+beta=90^(0) ,then the minimum a...

If `alpha+beta=90^(0)` ,then the minimum and maximum values of `cos alpha*cos beta` are
(A) `-1/3` and `1/3`
(B) `-1` and `1`
(C) `-1/4` and `1/4`
(D) `-1/2` and `1/2`

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