Which of the following is a process of adding labor to a project to reduce the project duration?

Forming is the first stage of Tuckman's team development model describing when a team first comes together, not a scheduling technique.

Storming is the second stage of Tuckman's team development model characterized by conflict and competition, not a schedule compression method.

Rolling wave planning is a progressive elaboration technique for planning work in stages as more detail becomes available, not a method for adding labor to reduce duration.

Crashing involves assigning additional resources - such as overtime, extra personnel, or parallel staffing - to critical path tasks in order to reduce their duration and thereby shorten the overall project schedule. It always involves a cost-schedule trade-off, as adding labor increases project cost while decreasing duration.