What is the following statement about KU resource pools correct?

When the resources of a single MCU in the region are insufficient, the two MCUs with the most abundant resources in the priority area are cascaded.

In the same service area, the system will preferentially select the MCU with the same prefix and the most abundant resources for venue access.

SUC3.0 unifies the management and scheduling of MCUs to achieve load balancing, sharing, and redundant backup of MCU resources.

The system matches the number prefix of the service area with the terminal number and determines the NCU resource pool that the terminal preferentially accesses.