Just A Second....

Yes uttara
Answer should "and"
Because the given expression is ax(bxc)
and hence perpendicular to both a and (bxc)

I don't know why you guys and gals are alsways stick to the answer.....
You must have confidence on ur answer and process...because in exam you dont have any extra sheet on which all answer are given....If you have habit of solving one question..and then checking its answer...then solving another checking its answer....then it would be dangerous...because in exam also..after solving question you will not have confidence to mark the option....because you will always think that whether it is correct or not..

Better,,,,way to solve question..
Take ot 50 -60 question....set alarm of 1 0r 1:30 hr...and solve completely without seeing answer..after solving check answer.....
The one which is wrong...do it three or four times...if getting same answer...be confident..that will be correct ofcourse...and for sure...

As far as I remember

(a.b)c - (a.c)b = a x (c x b)

and it is "and". answer given must be wrong.