Which statement about handcrafted service layer classes is true?

Which statement about handcrafted service layer classes is true?
A. The generators create the intf, base, and factory classes, while the developer provides the impl class.
B. Entity classes are not modeled, as they are provided by the Entity Interface.
C. The DAO Interface provides search (readmulti) operations.
D. Handcrafted service layer classes do not use structs.

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