A three‐phase transformer rated at 360 MVA, 345/115 kV (line‐to‐line voltage). Use these rated values as the base and find out the impedance base for both primary and secondary side systems.
a) 115 Ω, 360 Ω
b) 345 Ω, 360 Ω
c) 115 Ω, 115 Ω
d) 345 Ω, 115 Ω