Answer: a Recovery Services vault

The correct answer is D: a Recovery Services vault. A Recovery Services vault is a logical container that stores the backup data for each protected resource, such as Azure VMs. Before starting the backup process, you must create a Recovery Services Vault as an initial step to store the backups or restore points. This ensures that all virtual machines for App1 are protected by backups. References: Azure documentation on setting up backup for VMs and the configuration of Recovery Services vault.

Author: LeetQuiz Editorial Team