Branch current and loop current relation is expressed in matrix form shown below, where Ij represents branch current and Ik represents loop current.[I1; I2; I3; I4; I5; I6; I7; I8] = [0 0 1 0; -1 -1 -1 0; 0 1 0 0; 1 0 0 0; 0 0 -1 -1; 1 1 0 -1; 1 0 0 0; 0 0 0 1] [I1; I2; I3; I4]The rank of the incidence matrix is?

Branch current and loop current relation is expressed in matrix form

1.	Branch current and loop current relation is expressed in matrix form shown below, where Ij represents branch current and Ik represents loop current.[I1; I2; I3; I4; I5; I6; I7; I8] = [0 0 1 0; -1 -1 -1 0; 0 1 0 0; 1 0 0 0; 0 0 -1 -1; 1 1 0 -1; 1 0 0 0; 0 0 0 1] [I1; I2; I3; I4]The rank of the incidence matrix is?
A.	4
B.	5
C.	6
D.	8
Answer» B. 5