Certain amounts such as water supply fittings, sanitary fittings, door and window fittings, etc. are to be decided by the architect in consultation with his client at some future date. The details of such items are not worked out at the time of inviting tenders, but for execution of such items, a lump sum amount is put up in the bill of quantities. This amount is known as

• A. Prime cost
• B. Provisional sum
• C. Spot amount
• D. Deviated cost