Your roofing contractor came into your site office one day and asked you for the thickness of membrane require for the flat roof over the auditoriums. You kind of remember but you are not sure. How would you go about getting the answer? (1 mark) a) Phone up the roofing supplier and ask him what is available. b) Go to the specification and look under Division 9 - Finishes. c) Go to the specification and look under Division 7 - Thermal & Moisture Protection. d) Go to the specification and look under Division 7 - Thermal & Moisture Protection and check the architectural plan for any roof details.