For a facility with an average arrival rate of 45 units per hour-and a service rate of 60 units per hour, with a maximum system size of 3 units, which of the following statements is true?

• A. The probability the system is full-is 0.1054
• B. The average number of units waiting to be served and being served is 1.15 units
• C. The average time a unit spends waiting to be served is 1.8 minutes
• D. The average number of units waiting to be served is .64-units