Two points P and Q in the Argand diagram rep- resent complex numbers z and 3z + 2 + i. If P moves arround the circle with centre at the origin and radius 2, then Q moves on the circle, whose centre and radius are (a) -2- i, 6 (c) 2+ i, 6 (b) 2-i, 3 (d) 2+ i, 3 [2007]