A User Is Running One Instance for Only 3 Hours

Multiple Choice

A user is running one instance for only 3 hours every day. The user wants to save some cost with the instance. Which of the below mentioned Reserved Instance categories is advised in this case?

A) The user should not use RI; instead only go with the on-demand pricing
B) The user should use the AWS high utilized RI
C) The user should use the AWS medium utilized RI
D) The user should use the AWS low utilized RI