Which of the following statements is true of Amazon EC2 security groups?

Which of the following statements is true of Amazon EC2 security groups?
A . You can change the outbound rules for EC2-Classic. Also, you can add and remove rules to a group at any time.
B . You can modify an existing rule in a group.
However, you can’t add and remove rules to a group.
C . None of the statements are correct.
D . You can’t change the outbound rules for EC2-Classic.
However, you can add and remove rules to a group at any time.

Answer: D

Explanation:

When dealing with security groups, bear in mind that you can freely add and remove rules from a group, but you can’t change the outbound rules for EC2-Classic. If you’re using the Amazon EC2 console, you can modify existing rules, and you can copy the rules from an existing security group to a new security group.

Reference: http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/using-network-security.html