Which of the following is NOT correct regarding Amazon EC2 On-demand instances?
-  You have to pay a start-up fee when launching a new instance for the first time.
-  The on-demand instances follow the AWS pay-as-you-go pricing model.
-  With on-demand instances, no longer-term commitments or upfront payments are needed.
-  When using on-demand Linux instances, you are charged per second based on an hourly rate.