need urgent please . these two

5 5 points Which of the following statements is CORRECT regarding the waiting time in a single-server queue model? (Difficulty Level - Hard There may be more than one correct answer. Select All that apply. When variability in the arrival or service process increases, the average waiting time increases proportionally, When utilization increases, the average waiting time increases exponentially. When capacity decreases, the average waiting time increases, When the average arrival rate increases, the average waiting time decreases. 3 4 points When bullwhip effect occurs in a supply chain, which party tends to incur the highest cost? (Difficulty Level-Medium) Downstream retailer Wholesaler who is between downstream retailer and upstream supplier Customers Upstream supplier All parties incur similar costs