What must a lifter do after successfully completing a bench press?

After successfully completing a bench press, it is crucial for the lifter to wait for the "Rack" command to return the bar to the rack safely. This procedure ensures the safety of the lifter as well as the overall integrity of the competition. The "Rack" command signifies that the referee has approved the lift and allows the lifter to safely place the bar back onto the rack without risking injury.

Waiting for the command is an essential part of the competitive process, as it reinforces proper lifting etiquette and ensures that all lifters follow the same established rules. This is important because it maintains a standard of practice among competitors and enhances the safety features of the event.

The other options typically do not align with the protocols of a sanctioned powerlifting competition. Attempting a heavier lift immediately can lead to unsafe practices, starting to lift again without proper procedure can compromise safety, and recording the lift on the scoreboard is typically handled by officials, not the lifters themselves. Hence, waiting for the "Rack" command is the correct and safest action following a successful bench press.