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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

0ltthetaltpi/2'

B

0 le theta le pi/2'.

C

0lttheta leslant pi, '

D

0 le, theta le pi'

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B
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