Which of the Following Best Explains 'The Supplier's Specification

Multiple Choice

Which of the following best explains 'the supplier's specification'? 

A)  The buyer knows precisely the cost of the material to be purchased. 
B)  The seller knows precisely the cost of the material to be purchased. 
C)  The buyer can only obtain a rough indication of the product's cost by means of demand market research. 
D)  The buyer can only obtain a rough indication of the product's cost by means of supply market research.