Can a single EBS volume be attached to multiple EC2 instances at the same time?

Can a single EBS volume be attached to multiple EC2 instances at the same time?
A .  Yes
B .  No
C .  Only for high-performance EBS volumes.
D .  Only when the instances are located in the US regions.

Answer: B

Explanation:

You can’t attach an EBS volume to multiple EC2 instances. This is because it is equivalent to using a single hard drive with many computers at the same time.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AmazonEBS.html

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