When composing fields in a message, how many components must be sent?

The correct answer is that only the components that are valued need to be sent. In practice, especially when dealing with message composition in systems like Epic Bridges, it’s unnecessary to include every possible component if they do not hold any value. This approach helps streamline the message, making it more efficient by reducing the amount of data being transmitted. The idea is that a message should be as concise as possible while still conveying all necessary information.

In many messaging frameworks, optional fields can be left out if they don’t have relevant data. This flexibility allows for more dynamic and streamlined communication, reducing the risk of errors associated with including unnecessary or empty fields.

Other options suggest a more rigid approach, which is not typically how message composition is implemented in practice. Providing every component, mandating at least one component, or requiring only the first component to be sent would complicate the system and could lead to inefficiencies in data handling.