What are best practices when using models? Note: There are 2 correct answer to this question.

What are best practices when using models? Note: There are 2 correct answer to this question.
A . Create models using Java’s ‘new’ keyword
B. Use modelService.getQ to obtain an item referenced by another using its PK.
C. Save the model using the modelService after the model is modified.
D. Create models using modelService.create( ).

Answer: C,D