If there are M meshes, B branches and N nodes including reference node, the number of mesh currents is given as M=?

If there are M meshes, B branches and N nodes including reference node

1.	If there are M meshes, B branches and N nodes including reference node, the number of mesh currents is given as M=?
A.	B + (N+1)
B.	B + (N-1)
C.	B-(N+1)
D.	B-(N-1)
Answer» E.