“ Your AWS account automatically has a default security group for the default VPC in each Region” see https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/default-custom-security-groups.html
So answer is D.
It's C.
"By default, new security groups start with only an outbound rule that allows all traffic to leave the resource. You must add rules to enable any inbound traffic or to restrict the outbound traffic."
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html
Bad question anyway....
Source: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/default-custom-security-groups.html#default-security-group
Allows inbound traffic from network interfaces and instances that are assigned to the same security group.
---
This means that instances with same SG can talk to each other. As all outbound traffic is allowed by default.
A is correct.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/default-custom-security-groups.html#default-security-group
Inbound Rules -- Allows inbound traffic from network interfaces and instances that are assigned to the same security group.
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cldy
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