The common chord of two intersecting circles C1 and C2 can be seen from their centres at the angles of 90∘ & 60∘ respectively. If the distance between their centres is equal to 3+1 then the radii of C1 and C2 are –
(A) 3 and 3
(B) 2 and 22
(C) 2 and 2
(D) 22 and 4