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Vectors vec(AB) and vec(CD) are shown in...

Vectors `vec(AB) and vec(CD)` are shown in the standard (x,y) coordinate plane below. One of the following is the unit vector notation of the vector `vec(AB) + vec(CD)`. Which one?

A

`-6i + 3j`

B

`3i + 1j`

C

`3i + 9j`

D

`9i + 11j`

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The correct Answer is:
D
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