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Consider triangle A O B in the x-y plane...

Consider triangle `A O B` in the `x-y` plane, where `A-=(1,0,0),B-=(0,2,0)a n d O-=(0,0,0)dot` The new position of `O ,` when triangle is rotated about side `A B` by `90^0` can be a. `(4/5,3/5,2/(sqrt(5)))` b. `((-3)/5,(sqrt(2))/5,2/(sqrt(5)))` c. `(4/5,2/5,2/(sqrt(5)))` d. `(4/5,2/5,1/(sqrt(5)))`

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