If co-ordinates of a point P is (1, 2, 2) then unit vector along the position vector of the point P will be
The vector in the direction of the vector ^i−2^j+2^k that has magnitude 9 is
(a) ^i−2^j+2^k
(b) ^i−2^j+2^k3
(c) 3(^i−2^j+2^k)
(d) 9(^i−2^j+2^k)