Refer to the exhibits. The Set Variable transformer is set with value #[ { first: "Max", last: Mule" } ] What is a valid DataWeave expression to set as the message attribute of the Logger to access the value "Max" from the Mule event?

Select an option, then click Submit answer.
- ○ "customer.first"
- ○ vars."customer"."first"
- ○ vars."customer.first"
- ○ customer.first
