Which of the following is the project manager implementing when they allocate additional resources to a set of tasks that are in the critical path and are slowing down the project completion?

Crashing is a schedule compression technique where additional resources are assigned to critical path activities to reduce their duration, thereby shortening the overall project schedule, typically at an increased cost.

Optimizing is a broader term for making a process or system as effective as possible, not a specific technique for shortening a project schedule by adding resources.

Controlling is a project management process group that monitors project progress and ensures objectives are met, which is a continuous activity, not a specific technique for accelerating a schedule.

Fast tracking involves performing activities in parallel that would normally be done in sequence to shorten the schedule, rather than adding resources to individual tasks.