In Azure SQL Database, backups are taken automatically and kept for between 7 and 35 days. With the DTU model, a database under the Basic tier benefits from seven-day retention. Standard and Premium databases have 35 days retention. Under the vCore purchasing model, the default retention period is seven days, which can be increased up to 35 days. Azure SQL Database provides a number of business continuity capabilities. Which of the listed options is best described as "Provides a readable secondary replica for a given database in the same or different Azure region. This asynchronously replicates data by using the same technology as Always On availability groups. Up to four secondary replicas are permitted, and can be used for read-only workloads. You invoke the failover process using the application or via manual procedures with the Azure CLI, PowerShell, Transact-SQL, or the REST API" ?