When Amazon EC2 instances are stopped, they do not incur compute charges as they are not running. However, charges can still occur for associated resources. The correct answers are A and D. Option A refers to Amazon Elastic Block Store (Amazon EBS) storage charges, which continue to accrue as long as the EBS volumes are attached to the instances, even if they are stopped. EBS volumes are billed separately from EC2 instances. Option D refers to Elastic IP charges, which can occur if an Elastic IP address is allocated but not associated with a running instance. Elastic IP addresses are billed on an hourly basis, regardless of whether they are in use.