Which of the following is an example of a workplace rule?

Workplace rules are essential guidelines that help maintain a professional environment and ensure that operations run smoothly. Each option presented is indeed an example of a workplace rule, making the choice "All of the above" the most accurate.

Cellphone use typically falls under workplace expectations to minimize distractions and maintain professionalism. Organizations often implement rules regarding when and how employees can use their phones to create an environment conducive to productivity.

The length of lunch breaks is another specific workplace rule that helps structure the workday and ensures that all employees have adequate time to rest while also allowing the organization to manage workflow efficiently.

Attendance policies are critical in any workplace because they set expectations for punctuality and presence. Adhering to these rules is vital for team collaboration and operational success, as they help ensure that all staff members are fulfilling their roles.

By encompassing all these elements, "All of the above" effectively represents comprehensive workplace regulations that contribute to both individual accountability and overall organizational effectiveness.