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

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.