In order to meet the specified synchronization quality requirements, corresponding requirements must be made on the network for synchronous transmission, and the specified networking rules must be followed during network planning. Which of the following is wrong?

In order to meet the specified synchronization quality requirements, corresponding requirements must be made on the network for synchronous transmission, and the specified networking rules must be followed during network planning. Which of the following is wrong?
A . In one clock transmission direction, the number of stations between the transit office clocks cannot exceed 30
B. The number of switching office clocks cannot exceed 10
C. The total number of devices in one direction cannot exceed 60

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Answer: A