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Choose the correct answer. If theta is t...

Choose the correct answer. If `theta` is the angle between two vectors `veca"and"vecb`, then `veca.vecb ge 0` only when a)`0 lt theta lt pi/2` b)`0 le theta le pi/2` c)`0 lt theta lt pi` d)` 0 le theta le pi`

A

`0 lt theta lt pi/2`

B

`0 le theta le pi/2`

C

`0 lt theta lt pi`

D

` 0 le theta le pi`

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