Which statement about property changes in Mule 4 is true?

• A. Messages are now called events
• B. Inbound and outbound properties are now called attributes
• C. Session variables are removed
• D. Processing strategies still used

Answer: (B)

In Mule 4 the metadata attached to a message is accessed through a single attributes object on the event. Inbound and outbound properties from Mule 3 were replaced by this attributes container, so information like the HTTP method or the request path is read from attributes rather than from separate inbound/outbound properties. This consolidation—renaming those properties into a unified attributes structure—is why the statement about inbound and outbound properties becoming attributes is the correct one.

Think of how you read metadata now: it lives alongside the payload inside the event, and you reference it via attributes (for example, attributes.method or attributes.path). The other options describe changes that don’t reflect how Mule 4 handles property metadata: the event wrapper exists but isn’t simply a rename of messages to events, and the idea of processing strategies or session variables staying the same isn’t the change being described here.