What will be the difference while performing the restart or stop/start options on that instance?

A user has launched an EBS backed EC2 instance.

What will be the difference while performing the restart or stop/start options on that instance?
A . For restart it does not charge for an extra hour, while every stop/start it will be charged as a separate hour
B . Every restart is charged by AWS as a separate hour, while multiple start/stop actions during a single hour will be counted as a single hour
C . For every restart or start/stop it will be charged as a separate hour
D . For restart it charges extra only once, while for every stop/start it will be charged as a separate hour

Answer: A

Explanation:

For an EC2 instance launched with an EBS backed AMI, each time the instance state is changed from stop to start/ running, AWS charges a full instance hour, even if these transitions happen multiple times within a single hour. Anyway, rebooting an instance AWS does not charge a new instance billing hour.