If the branch-line impedance of a coupler designed to operate at 1 GHz is 70.70 Ω, then the characteristic impedance of the material of the arms of the branch-line coupler is:

If the branch-line impedance of a coupler designed to operate at 1 GHz

1.	If the branch-line impedance of a coupler designed to operate at 1 GHz is 70.70 Ω, then the characteristic impedance of the material of the arms of the branch-line coupler is:
A.	70.7 Ω
B.	50 Ω
C.	100 Ω
D.	None of the mentioned
Answer» D.