Which of the following must apprentices or learners do while working on installing, altering, and repairing mechanical equipment?

The correct choice highlights the requirement for apprentices or learners to register with the city of St. Cloud as part of their training and professional development in the mechanical field. This registration is a critical step as it allows the local governing body to maintain oversight and ensure that all mechanical work is performed safely and in compliance with local codes and regulations. By registering, apprentices also gain access to resources and support that can be vital to their development.

Working independently is inappropriate for apprentices, as they are still in a learning phase and require supervision to ensure that they are developing their skills accurately and safely. Similarly, the notion of only working on residential projects restricts the scope of their training and is not a requirement in the professional landscape; apprentices often need exposure to various types of projects, including commercial ones, to gain a comprehensive understanding of the field. Registration ensures that the work performed by apprentices is legitimate, regulated, and contributes to their learning experience while under the guidance of a qualified mentor.