Consider three items with the following profiles in a warehouse: (Items, Annual Demand (units), Annual Requests, Unit Cube (ft3)), (X, 200, 20, 1), (Y, 100, 15, 0.5), (Z, 300, 10 , 2). What is the total demand in cube for all three items?
A. 850 ft3;
B. 460 ft3;
C. 250 ft3;
D. 700 ft3;
E. None of them