Which of the following understanding of the working principle of high availability cluster is correct? (Multiple choice)

Which of the following understanding of the working principle of high availability cluster is correct? (Multiple choice)
A . computing system high availability to measure by the system reliability and maintainability
B . High availability cluster has two working modes: Active-Active working mode and Active-Standby working mode
C . In the Active-Standby high-availability cluster, the standby server detects the operating status of the master server through a heartbeat line, but it cannot detect the "heartbeat" of the master server, and then automatically takes over the resources of the master server.
D . High-availability cluster refers to the use of the fault tolerance of the cluster system to provide 7*24 hours of uninterrupted service to the outside, designed to provide highly reliable services

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Answer: ABCD