Which of the Following Best Explains 'Proportionality

Multiple Choice

Which of the following best explains 'proportionality'? 

A)  Specifications and conditions should be in line with the nature of the assignment and linked to the subject matter. 
B)  Costs and risks should be shared between purchaser and supplier. 
C)  Specifications and conditions should not be in line with the nature of the assignment and not linked to the subject matter. 
D)  Specifications and conditions should allocate proportional responsibility between purchaser and suppliers.