An Uncharged Spherical Conducting Shell Surrounds a Charge -Q at the Centre

An uncharged spherical conducting shell surrounds a charge -q at the centre of the shell.Then charge +3q is placed on the outside of the shell.When static equilibrium is reached, the charges on the inner and outer surfaces of the shell are respectively:

A) +q, -q.
B) (-q, +q.)
C) +q, +2q.
D) +2q, +q.
E) +3q, 0.