Please select the Amazon EC2 resource which can be tagged.

A.
key pairs

B.
Elastic IP addresses

C.
placement groups

D.
Amazon EBS snapshots

Explanation:
Placement group and Elastic IP cannot be tagged.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html Snapshots can be tagged: http://
docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html