Use the following problem statement to answer questions 23-25. [Scheduling] A hospital wants to determine the nursing schedule to minimize total cost. Their staff consist of full-time nurses who work eight-hour shifts and part-time nurses who work four-hour shifts. The supervisor of nurses divides the day into six four-hour periods. In each period, a different level of demand requires different numbers of nurses to hire. The minimum number of nurses required is shown in Table 1 . It is also required that there must be at least 7 full-time nurses at each time period. The full-time nurses get paid $110 per shift while the part-time nurses get paid $50 per shift. The normal shifts can begin at the start of any of the four-hour periods. [Note: Xi= no. of full-time nurses beginning their shift at time period i, where i=1,2,3,4,5, and 6 . Yi= no. of part-time nurses beginning their shift at time period i, where i=1,2,3,4,5, and 6 .] Time Period Min. number of nurses needed 1. 7:00 AM - 11:00 AM: 21 2. 11:00 AM - 3:00 PM: 25 3. 3:00 PM - 7:00 PM: 18 4. 7:00 PM - 11:00 PM: -21 5. 11:00 PM - 3:00 AM: 16 6. 3:00 AM - 7:00 AM: 15 [T/F] The objective function for the model is MinZ=110(X1+X2+X3+X4+X5+X6)+50(Y1+ Y2+Y3+Y4+Y5+Y6). True False Which of the following constraints is correct? x1+x47 X4+X67 x1+x27 x3+x57 Question 25 Which of the following constraints is correct? X2+X325 X1+X5+Y2=25 x1+x2+x325 X1+X2+Y225