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The DevOps team at a financial services company has provisioned a new GPU optimized EC2 instance X by choosing the default security group of the default VPC. The team can ping instance X from other instances in the VPC. The other instances were also created using the default security group. The next day, the team launches another GPU optimized instance Y by creating a new security group and attaching it to instance Y. All other configuration options for instance Y are chosen as default. However, the team is not able to ping instance Y from other instances in the VPC. As a Solutions Architect Professional, which of the following would you identify as the root cause of the issue?