When will you incur costs with an Elastic IP address (EIP)?
When an EIP is allocated.
When it is allocated and associated with a running instance.
When it is allocated and associated with a stopped instance.
Costs are incurred regardless of whether the EIP is associated with a running instance.
You can have one Elastic IP (EIP) address associated with a running instance at no charge. If you associate
additional EIPs with that instance, you will be charged for each additional EIP associated with that instance per
hour on a pro rata basis.