Which of the following is NOT a type of Mule router?

The correct answer focuses on understanding the types of routing mechanisms available in Mule applications.

Choice routers are fundamental components of Mule that help direct the flow of messages based on certain conditions. The Choice router allows for routing based on specified criteria, determining which path a message takes based on the evaluation of expressions.

The First Successful router is designed to wait for responses from multiple routes and proceeds with the response from the first successful execution, which is valuable in scenarios where multiple services may provide the same information, and speed is essential.

The Scatter-Gather router allows for sending messages to multiple endpoints concurrently and then aggregating their responses. This pattern is particularly useful for executing parallel tasks and reducing overall response time.

However, "Sequential" is not an established type of Mule router. While routing can occur in sequence, the terminology specifically for routers in Mule does not include a router explicitly named "Sequential." Understanding the functionality of different routers helps clarify how a Mule application can manage complex integration scenarios effectively.