Which statements are correct about Huawei SMC resource pool management?

Huawei SMC3.0 introduced advanced Resource Pool Management features:

Option A: The SMC monitors the load and performance of all MCUs/RSEs in a pool, automatically routing new calls to the node with the most available capacity (Load Balancing).

Option B: If a physical MCU fails, the SMC can migrate participants to another active MCU in the pool to ensure high availability and meeting continuity.

Option C: Resources (like media ports) are allocated only when a conference actually starts. Simply "scheduling" a meeting doesn't consume live hardware ports, allowing for higher efficiency.

Option D: The system supports multi-level, hierarchical networking where MCUs in different geographic regions can be cascaded automatically to optimize bandwidth and provide local access.