You can use ____ to send and receive messages in dynamic, two-way communications.

What is a Security Group?

A. None of these. B. A list of users that can access Amazon EC2 instances. C. An Access Control List (ACL) for AWS resources. D. It acts as a virtual firewall that controls the traffic for one or more instances.

MC Nodes that contain other nodes (called__________ nodes) are called__________ nodes.

a) parent, child. b) child, parent. c) sibling, parent. d) None of the above.