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A force of -F hatk acts on O, the origin...

A force of `-F hatk` acts on O, the origin of the coordinate system. The torque about the point (1, -1) is

A

`-F (hati + hatj)`

B

`F(hati + hatj)`

C

`-F(hati - hatj)`

D

`F (hati - hatj)`

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