please answer the correct answer

Question 4 Not yet answered Marked out of 1.00 p Flag question Shrek and Fiona need 5 items of furniture sofn, a chair, a dining table, a desk and a bed. There are several deals available from various shop . They can buy son and a chuir for 400. They can buy a dank and schnir for 120. They can buy adining table and a sofn for 500. They can buy a sofa, a chair and a dining table for 600. It is also possible to buy the items individually for the following price: Price 350 Chair 270 Dining table 150 Denk 100 Bed L200 Shrek nnd Fionn are looking for the chenpest way to purchase will 5 items. Formulate this as a set covering problem in LP Solve format. What is the objective function? Sofa O a. none of the above O b. min: 350x1 + 70x2 + 150x3 + 100x4 + 200x5 + 400x6 + 120x7 + 500x8 + 600x9; O c. max: 350x1 + 70x2 + 150x3 + 100x4 + 200x5 + 400x6 +120x7 + 500x8 + 600x9; O d. x1+x6+x8+x9>=1