In Amazon RDS, security groups are ideally used to:

In Amazon RDS, security groups are ideally used to:
A .  Define maintenance period for database engines
B .  Launch Amazon RDS instances in a subnet
C .  Create, describe, modify, and delete DB instances
D .  Control what IP addresses or EC2 instances can connect to your databases on a DB instance

Answer: D

Explanation:

In Amazon RDS, security groups are used to control what IP addresses or EC2 instances can connect to your databases on a DB instance.

When you first create a DB instance, its firewall prevents any database access except through rules specified by an associated security group.

Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.html

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