Which of the following questions would not be relevant to a make or buy decision?

A、Willthesuppliermakeaproductthatisequalinqualitytoourown?;
B、Willthesuppliermeetourspecifieddeliverydates;
C、Forhowlongwillthesupplierbecommittedtothequotedprice?;
D、Alloftheabovequestionsarerelevant.