The position vector of a point is R=xhat...

The position vector of a point is `R=xhati+yhati+zhatk` and another vector is `A=3hati+2hatj+5hat`. Which of the mathematical relationns is correct?

`nabla(A*R)=0`

`nabla(A*R)=A`

`nabla(A*R)=R`

none of these

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