A User Has Setup an RDS DB with Oracle

Multiple Choice

A user has setup an RDS DB with Oracle. The user wants to get notifications when someone modifies the security group of that DB. How can the user configure that?

A) It is not possible to get the notifications on a change in the security group
B) Configure SNS to monitor security group changes
C) Configure event notification on the DB security group
D) Configure the CloudWatch alarm on the DB for a change in the security group