What should you do to make a new field mandatory when the test status changes to Ready?

A.
Set configuration options for the new field via Customize > Workflow > Script Generator-Test
Details Field Customization.

B.
Modify the code of the appropriate event function in Customize > Workflow > Script Editor.

C.
Set configuration options for the new field via Customize > Project Entities > Test > User Fields.

D.
Create a custom event function in Customize > Project Entities > Test > User Fields.