Final answer:
The total time taken to process all events in a scatter-gather component in Mule is determined by the duration of the longest event, which is 20 seconds in this case (option b).
Step-by-step explanation:
The question revolves around the scatter-gather component in a Mule application and the time it takes to process 3 different events before moving on to the next component. The scatter-gather route allows multiple events to be processed concurrently. Given that Event 1 completes in 10 seconds, Event 2 in 15 seconds, and Event 3 in 20 seconds, we have to identify the total time taken for the scatter-gather component to process all events.
The key to answering this question is understanding that a scatter-gather component processes all routes in parallel. Therefore, the total time taken to complete processing all events is determined by the longest route, since all events are processed simultaneously. In this case, the third event takes the longest to complete, which is 20 seconds.
Hence, the correct option for the total time taken to process these 3 events before proceeding to the next component is 20 seconds, which is option b.