When adding event handlers to an application, what should be done first?

The correct approach is to add all object types to the application first because defining the object types establishes the context for the event handlers. Event handlers are designed to respond to interactions or actions that occur with these objects. By ensuring that the object types are fully defined and integrated into the application, you can appropriately connect event handlers to the specific behaviors and properties of those object types.

This preparatory step is crucial because if you attempt to add event handlers before the object types exist, there would be no objects available for those handlers to interact with, potentially leading to issues or errors in the application's functionality.

While adding event handlers along with object types could be a feasible approach, it is generally more structured to define the components first to maintain clarity and organization in application development. The other options either suggest a less organized method of integration or restrict the types of objects that can have handlers, which could limit functionality.