You must design an Oracle Data Guard configuration for a DSS database that meets these permanent

requirements:

1. Creating and maintaining bitmap indexes should not impact the performance of the primary database.

2. Creating and maintaining materialized views should not impact the performance of the primary database.

Additionally, there are these requirements, only one of which is ever done at any one time:

1. It should be possible to apply designated patches with a minimum amount of downtime.

2. Upgrading to a new database release should be performed with the least possible amount of downtime.

3. New application software releases should be tested against an exact and up-to-date replica of the primary database.

Which configuration meets these requirements with the fewest of databases?