The impedance matching network shown in the figure is to match a lossless line having characteristic impedance Z0 = 50 Ω with a load impedance ZL. A quarter-wave line having a characteristic impedance Z1 = 75 Ω is connected to ZL. Two stubs having characteristic impedance of 75 Ω each are connected to this quarter-wave line. One is a short-circuited (S.C.) stub of length 2.55 λ connected across PQ and the other one is an open-circuited (O.C.) stub of length 0.5λ connected across RS. The impedance matching is achieved when the real part of ZL is

• A. 112.5 Ω
• B. 75.0 Ω
• C. 33.3 Ω
• D. 50.0 Ω