Mule 4 applications are built using components that are

• A. Mule Message Processors
• B. Mule Flow Components
• C. Mule Event Processor
• D. Mule Service Components

Answer: (C)

In Mule 4, applications are built as a sequence of event processors inside flows. Each component you add to a flow is an event processor: it takes the incoming MuleEvent, does its work (like logging, transforming data, routing, or calling a service), and then passes the event to the next processor. This chain of processors defines how the message moves and is transformed through the flow.

The term event processor is the correct descriptor for these building blocks in Mule 4, which is why this option fits best. Older or less precise terms such as message processor or flow component aren’t the standard terminology in Mule 4, and service components isn’t how the framework describes the pieces that handle the event as it traverses a flow.