A. In EC2-Classic, you can associate an instance with up to 5 security groups and add up to 50 rules to a security group. In EC2-VPC, you can associate a network interface with up to 500 security groups and add up to 100 rules to a security group.
B. In EC2-Classic, you can associate an instance with up to 500 security groups and add up to 50 rules to a security group. In EC2-VPC, you can associate a network interface with up to 5 security groups and add up to 100 rules to a security group.
C. In EC2-Classic, you can associate an instance with up to 5 security groups and add up to 100 rules to a security group. In EC2-VPC, you can associate a network interface with up to 500 security groups and add up to 50 rules to a security group.
D. In EC2-Classic, you can associate an instance with up to 500 security groups and add up to 100 rules to a security group. In EC2-VPC, you can associate a network interface with up to 5 security groups and add up to 50 rules to a security group.

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