Which of the following statements about shadow cameras camera cloning in the IVS are correct?

The correct answers are B, C, and D . The backup-related domain logic in the material shows that video backup is a structured platform function used to store and manage recordings from another domain or source set. The document states that users can “use the live video and recording backup function to back up recordings of a lower-level domain to MPUs of the local domain, domains of the same level, and upper-level domain” and also refers repeatedly to Video Backup Configuration as the operational process for this function . In practical IVS design, shadow cameras exist precisely to represent cloned source cameras on the backup destination side so backup and playback operations can be performed there.

That is why shadow cameras must be created before the backup function is used, making D correct. Because those cloned objects are used for backup and playback management, B and C are also correct. However, shadow cameras are not primarily created for normal real-time live-view service in the backup domain, so A is not accepted as a correct statement. Their main purpose is backup representation, management visibility, and playback-oriented access rather than ordinary live browsing.