How is the Build Only button used when checking for generator errors?

[answerhappygod]

How is the Build Only button used when checking for generator errors?

A. Build Only is a tool which steps you through a model build eliminating the possibility of generator errors.
B. Build Only will show how variables interact within the model and produces a list of all interactions.
C. Build Only will generate the code necessary to process the model, showing any warnings or errors that the generator finds when creating the code.
D. Build Only will automatically produce output specific to each calculation allowing detailed checking.