A User Has Launched an EBS Backed EC2 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