What is one cause of the problem?

A SysOps administrator is troubleshooting connection timeouts to an Amazon EC2 instance that has a public IP address. The instance has a private IP address of 172.31.16.139. When the SysOps administrator tries to ping the instance’s public IP address from the remote IP address 203.0.113.12, the response is "request timed out." The flow logs contain the following information:

What is one cause of the problem?
A . Inbound security group deny rule
B . Outbound security group deny rule
C . Network ACL inbound rules
D . Network ACL outbound rules

View Answer

Answer: D