If `absveca=2`,`absvecb=3` and `theta` is the angle between `veca` and `vecb`. Then the maximum value of `veca.vecb` occurs when` theta`=.....a)`pi/2` b)`pi` c)0 d)`pi/4`
A
`pi/2`
B
`pi`
C
0
D
`pi/4`
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