Which of the following statements about milestone billing are correct?

The revenue value of the sales order item can be assigned to dates in the billing plan.

The amount to be billed is entered directly in the milestones of the WBS elements or activities.

The billing block on a billing date is removed when the related milestone is confirmed with an actual date.

For each billing date in a billing plan, you can define whether the date is fixed or whether it is moved along with the dates of the milestone.

If a milestone is to be used as a date in a billing plan, the "Sales document date" indicator must be activated in the milestone.