What is the likely cause of this problem?

After restoring an Amazon RDS snapshot from 3 days ago, a company’s Development team cannot connect to the restored RDS DB instance.

What is the likely cause of this problem?
A . The restored DB instance does not have Enhanced Monitoring enabled
B . The production DB instance is using a custom parameter group
C . The restored DB instance is using the default security group
D . The production DB instance is using a custom option group

View Answer

Answer: C

Explanation:

https://aws.amazon.com/premiumsupport/knowledge-center/rds-cannot-connect/

https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_RestoreFromSnapshot.html