A force `F=5hati + 2hatj - 5hatk` acts on a particle whose position vector is `r =hati - 2hatj + hatk`. What is the torque about the origin ?
Options:
(a) `8hai + 10hatj + 12hatk`
(b) `8hati+ 10hatj- 12hatk`
(c) `8hati- 10hatj — 8hatk`
(d) `10hati-10hatj-hatk`