Consider a three-node open Jackson Network as described below. The external (Poisson process) arrival rate at node 1 is 25 per hour, and there are no external arrivals to other nodes. The service rate at each node is as follows: node 1 = 30 per hour, node 2 = 40 per hour, and node 3 = 35 per hour.
What is the service rate at node 2?
a) 25 per hour
b) 30 per hour
c) 40 per hour
d) 35 per hour