A three-phase transmission line is characterized by the following parameters: length of 400 km, voltage rating of 500 kV at a frequency of 60 Hz, and a nominal power of 900 MVA. The line exhibits a series impedance of 0.2 +2.5j Q2/km and a shunt admittance of 4.4 x 10-6S/km. When operating at full load, delivering 800 MW at unity power factor and a voltage of 475 kV, determine the following parameters using per unit quantities: Hint: use the nominal V and S as base values. a) Base Impedance. b) The Receiving end current in per unit. c) ABCD parameters in per unit. d) The sending end voltage in per unit. e) The sending end current in t per unit. f) The theoretical maximum power at the receiving end in MW. g) Voltage Regulation..