Q .     If in a right-angled triangle `ABC`, the
hypotenuse `AB = c`, then

`vec(AB) * vec(AC) + vec(BC) * vec(BA) + vec(CA) * vec(CB)` is

BITSAT Mock
A

`2c^2`

B

`c^2/2`

C

`3c^2`

D

`c^2`

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