In a certain frequency plan, in addition to the main BCCH frequency, the 6M band is allocated to the TCH, and 1×3 frequency hopping is adopted. To ensure that the same adjacent frequency collision does not occur in the same base station, the maximum station configuration is:

In a certain frequency plan, in addition to the main BCCH frequency, the 6M band is allocated to the TCH, and 1×3 frequency hopping is adopted. To ensure that the same adjacent frequency collision does not occur in the same base station, the maximum station configuration is:
A . S444
B . S555
C . S666
D . S777

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Answer: C