Which of the following descriptions about the enhanced MSTP subway solution are correct? (Multiple Choice)

The correct answer is A. Line bandwidth can reach 20G and support smooth switching to 40G services B. Unified bearer, TDM services and Ethernet services are independently forwarded and carried C. A single ring has a maximum of 64 nodes, supporting multiple tangent/intersecting topologies D. MRPS+SNCP dual-plane protection, protection switching time far less than 50ms. See the full explanation below for the reasoning.

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ALine bandwidth can reach 20G and support smooth switching to 40G services
BUnified bearer, TDM services and Ethernet services are independently forwarded and carried
CA single ring has a maximum of 64 nodes, supporting multiple tangent/intersecting topologies
DMRPS+SNCP dual-plane protection, protection switching time far less than 50ms

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