A web client submits a request to http://localhost:8081/books/0471767840. The value `0471767840` is captured by a Set Variable transformer to a variable named bookISBN. What is the DataWeave expression to access bookISBN later in the flow?
C is correct.
Set Variable sets a variable in the current Mule event, and the variables then travel with the Mule event to downstream event processors. You can access any variable with DataWeave using vars. So if you set a variable named lastMessage, you can access it as vars.lastMessage.
Reference: https://docs.mulesoft.com/mule-runtime/4.3/variable-transformer-reference
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