You are configuring a new application deployment on AWS and have set up several EC$2$ instances to host different components of your application. To ensure security, you decide to create a custom security group for these instances. After creating the security group, you realize you haven't added any rules to it yet.

What will be the impact on your application's network traffic with the current configuration of the security group?

answer

All inbound and outbound network traffic to the instances will be dropped.

The instances will only accept traffic on port $80$ and $443$ by default.

Outbound traffic from the instances to the Internet will be allowed, but inbound traffic will be blocked.

The application components will be able to communicate with each other but not with the Internet.