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If |vec A timesvec B|=vec A*vec B, then ...

If `|vec A timesvec B|=vec A*vec B`, then the value of `|vec A+vec B|` is
(a) `(A^(2)+B^(2)+AB)^(1/2)`
(b) `(A^(2)+B^(2)+sqrt3AB)^(1/2)`
(c) `(A^(2)+B^(2)+sqrt2AB)^(1/2)`
(d) `(A^(2)+B^(2)+2AB)^(1/2)`

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