When creation of an EBS snapshot Is initiated but not completed the EBS volume?

A.
Cannot De detached or attached to an EC2 instance until me snapshot completes

B.
Can be used in read-only mode while me snapshot is in progress

C.
Can be used while me snapshot Is in progress

D.
Cannot be used until the snapshot completes

Explanation:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-copy-snapshot.html