Oracle Exam 1Z0-066 Topic 8 Question 47 Discussion

You must design an Oracle Data Guard configuration for an OLTP database that meets these permanent requirements:

1. Data loss is not permitted.

2. Read-only applications should not connect to the primary database instance.

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 databases?