please answer all 3 questions

Maintenence at a major theme park in centrai Fiorida is an onpoing process that octurs 24 hours a day. Because it is a long drive from most residential areas to the park, employees do nof like to work shifts of fewer than 8 hourh. These eighthour shits start every 4 hours throughout the day. The number of maintenance workers needed at different times throughout the day varies. The following table summarizes the minimum number of employees needed in each 4-bour time period. The maintenance supervisor wants to determine the minimum number of employees to schedule that meets the minimum stamng requirements a. Seiect the correct u model for this problem. Lit X1 represent Niumber of wokkers starting at 12 am Let X2 represent Number of workers starting ot 4 am. Let X3 represent Number of workers starting at 8 am. Let X4 repcesent Number of workers staring at 12 pm Let Xs represent Number of workers starting at 4 pm. Let X6 represent Number of workers starting at 8pm. I Minx1+x2+x3+x4+x5+x6 II maxx3+x2+x3+x4+x5+x6 ST x6+x1250x1+x2215x2+x390x3+x4300x1+x5165x5+x6125x10 ST x6+x1165 x1+x2215x2+x3250x3+x490x4+x5300x5+x6125x1>0 minm1+x2+x3+x4+x5+x6 ST x1, x4+x190x1+x2215x2+x3250x3+x4165x4+x5300x5+x6125x10 IV maxx1+x2+x3+x4+x5+x6 51x6+x1300x1+x2215x2+x3165x3+x4250x1+x590x5+x6125x1>0 b. Create spreadsheet model for this problem and solve it using Solver. What is the minimum number of emplovees to schedule that meets the minimum staffing recuirements? if your answer is zero, enter " 0 ". c. What is the total number of employees ror une oprimar movion