A bank of 10 machines requires regular periodic service. Machine running time and service time are both exponential. Machines run for an average of 44 minutes between service requirements, and service time averages six minutes per machine. What is the probability that a machine will have to wait for service with two operators?
A) 0.346
B) 0.016
C) 0.910
D) 0.090
Please show all work and provide an explanation.