Which of the following are feedforward control models?

1. A project planning model which uses critical path analysis to identify in advance any delays that might postpone completion of the project, so that corrective action can be taken if necessary.

2. A production planning model that accesses information from sales forecasts to identify in advance any constraints on delivery vehicle capacity. Arrangements can be made to hire additional vehicles as necessary.

3. A variance analysis control model that uses pre-determined control limits to identify significant variances as soon as they arise, so that management action can be taken immediately.