In the GSM system, the propagation model used to predict the path loss of the 1800M macrocell is:

In the GSM system, the propagation model used to predict the path loss of the 1800M macrocell is:
A . Keenan-Motley
B . Cost231 Walfish-Ikegami
C . Cost231-Hata
D . Okumura-Hata

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Answer: C