$($T$)$ You

What's the most signficant difference between a set of iptables rules and an AWS Security Group?

Iptables is more secure than a Security Group.

A Security Group is more secure than iptables.

Attackers can see the layout of iptables better than the configuration of a Security Group.

Iptables rules apply to the server they're on$.$ A security group exists independently of any VM$,$ and can be applied to multiple VMs$.$