What is the purpose of calling another activity in a Pega application?

Calling another activity in a Pega application serves the primary purpose of modularizing and reusing processes. By organizing functions into distinct activities, developers can create a more efficient and maintainable application. This modular approach allows for specific tasks or processes to be encapsulated within separate activities, making it easier to manage and update them independently.

Reusability is a key advantage; once an activity is created, it can be invoked from multiple locations within the application without the need to duplicate code. This not only saves time in development but also enhances consistency across the application, as changes made to a single activity will be reflected wherever that activity is called.

For instance, if a common data validation process is needed in different parts of the application, creating an activity for that specific validation allows it to be reused in various scenarios, thereby promoting DRY (Don't Repeat Yourself) principles in application design.

The other options, while they pertain to different functionalities, do not capture the core rationale behind calling another activity within Pega.