Which statements about network color codes are correct? (Multiple choice)

Which statements about network color codes are correct? (Multiple choice)
A . NCC and BCC together form a base station identification code (BSIC), which is transmitted on the synchronization channel (SCH) of each cell
B. It is generally stipulated that GSM PLMNs in neighboring countries choose different NCCs, so only BCCs need to be negotiated for domestic provincial and municipal network planning.
C. It must be ensured that adjacent or close cells using the same BCCH carrier frequency have different BSICs. Therefore, we must pay special attention to the configuration of the districts at the junction of provinces and cities
D. BCC value can be from 1 to 7

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Answer: AC