A power system consists of two areas connected via a tie line. While entering the data for load flow the tie line parameters and its connectivity data were inadvertently left out. If the load flow program is run with this incomplete data, then the load flow calculations will converge only if

a.       One slack bus is specified in the first area

b.      One slack bus is specified in the second area

c.       One slack bus is specified in either of the two areas

d.      Two slack buses, one in each area are specified