More effort needs to be put into the search and selection of suppliers for these items: (A) standard (B) non-strategic (C) raw materials (D) custom made (1) 4. _______ are time-consuming and usually costly, but information can be obtained about a supplier that cannot be obtained from an interview or questionnaire. (A) Presentations (B) Proposals (C) Supplier audits (D) Supplier visits (1).