The characteristic impedance (Surge Impedance Z_c) of an overhead transmission line is typically around:
A1000 Ohms
B400 Ohms
C4 Ohms
D40 Ohms
Explanation
Overhead transmission lines have surge impedance Z_c = sqrt(L/C) in the range of 300 to 400 ohms (underground cables are ~40-50 ohms).

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