A.2 B.3 C.3.5 D.5
A.s=<{2,4},{3,5,6},{8}>,t=<{2},{3,6},{8}> B.s=<{2,4},{3,5,6},{8}>,t=<{2},{8}> C.s=<{1,2},{3,4}>,t=<{1},{2}> D.s=<{2,4},{2,4}>,t=<{2},{4}>