What does the On Parameters Change event allow a Block to do?

The On Parameters Change event is specifically designed to allow a Block to react when there are changes to its input parameters that come from the parent screen. When the parent screen passes new values or updates existing ones to the Block, this event is triggered. As a result, the Block can then execute any necessary logic or update its display based on the new input values. This functionality is crucial for maintaining data synchronization and dynamic behavior within applications, allowing for more responsive user interfaces.

The other options do not accurately describe the purpose of the On Parameters Change event. It does not allow a Block to change parameters of the parent screen, submit data to the server, or fetch new data directly from a database. Instead, it focuses on facilitating a reaction to updates in the Block's input parameters, thus enhancing its interactivity and alignment with the state of the parent screen.