Option 3 is Delivery Control which is not an actual delivery in itself, but is used to control some other delivery created as part of this workflow.
Imagine you have a use case to send out a delivery, wait for 10 hours and then pause the delivery sending. Later resume it again on the next day at 9 AM.
So you can use a delivery activity of type option 1or 2 and then apply wait activity of 10 hours. Follow this one with Delivery control activity (option 3) and you can pause the already running delivery.