What is the most common method for testing a DFDL model in the toolkit?

What is the most common method for testing a DFDL model in the toolkit?
A. Use the DFDL tester to parse the sample data file
B. Add a breakpoint into sample test data and use the debugger
C. The DFDL schema can be validated by right clicking on the sample data
D. The DFDL parser can only be tested when a sample test data is passed into message flow from the Input Node

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