Which of the Following Statements Regarding Suppliers Is True

Which of the following statements regarding suppliers is true?

A) Supplier quality is not a concern for most companies because most companies make what they need as opposed to sourcing raw materials or components externally.
B) Suppliers should be included in the cross-functional product design team.
C) Supplier management is essentially careful selection and then measurement of quality compliance.
D) Supplier certification means their products are of highest quality.