Use the following problem statement to answer questions 4-6. A charity group's annual fundraising is scheduled to take place next week. Donations are collected during the day and night, by telephone, and through personal contact. The average donation resulting from each type of contact is as follows: The charity group has enough donated gasoline and cars to make at least 300 personal contacts for one day and night combined. The charity has 30 volunteer hours available each day and 40 volunteer hours available each night. The volunteer minutes required to conduct each type of interview are as follows: The manager of the group wants to know how many different types of contact to schedule in a 24 -hour period (i.e., 1 day and 1 night) to maximize total donations. [Note: X1 = no. of day contacts by phone. X2= no. of day contacts in person. X3= no. of night contacts by phone. X4= no. of night contacts in person.] Which of the following objective functions is correct? MinZ51+42+63+84MaxZ=51+42+63+84MinZ=51+42+63+84 Which of the following constraints is correct? 61+1523061+1521,80061+1521,200 Question 6 Which of the following constraints is correct? x2+x4300x2+x4=300x2+x4300