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

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

.
A. `F(hat i- hat j)`
B. `-F(hat i+ hat j)`
C. `F (hat i+ hat j)`
D. `- F(hat i- hat j)`

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