At a 220 kV substation of a power system, it is given that the three-phase fault level is 4000 MVA and single-line to ground fault level is 5000 MVA. Neglecting the resistance and the shunt susceptances of the system,         

(A) The positive sequence driving point reactance at the bus is:

(a) 2.5 Ω          (b) 4.033 Ω

(c) 5.5 Ω          (d) 12.1 Ω

(B) And the zero sequence driving point reactance at the bus is:                

(a) 2.2 Ω          (b) 4.84 Ω

(c) 18.18 Ω          (d) 22.72 Ω