Assuming that the serving cell has PCI=5 and adopts 2*2 MIMO, which of the following neighboring areas will have mode 3 interference with the serving cell? (Multiple choice)

Assuming that the serving cell has PCI=5 and adopts 2*2 MIMO, which of the following neighboring areas will have mode 3 interference with the serving cell? (Multiple choice)
A . PCI=7 neighboring area
B . PCI=23 neighboring area
C . PCI=8 neighboring area
D . PCI=30 neighboring area

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Answer: BC