Which two are prerequisites for configuring Transaction…

Which two are prerequisites for configuring Transaction Guard in a Data Guard environment?

A.
Grant execute permission on the DBMS_APP _CONT package to relevant database schema owners

B.
Create a database service with COMMIT_OUTCOME set to TRUE, and ensure clients use that service to connect to the database instance.

C.
Ensure that connection descriptors for database clients use the failover clause with the CONIM| T_OUTCONIE parameter set to TRUE

D.
Set INSTANCE_NANIE identically on all the Data Guard Configuration databases and modify the local service name on the client to include a CONNECT|ON_L|ST containing all the standby hosts.

E.
Create a database service with COMMIT_OUTCOME set to TRUE and ensure that the service is statically registered with the default listener on the primary host