Consider a three

$-$

node open Jackson Network as described below. The external

$($

Poisson process

$)$

$$arrival rate at node

$1$

$$is

$2$

$5$

$$ per hour and there are no external arrivals to other nodes. There are two servers at each node. The mean

$($

exponentially distributed

$)$

$$service time at node

$1$

$$ is

$3$

$$ minutes, at node

$2$

$$ it is

$2$

$$ minutes, and at node

$3$

$$ it is

$1$

$5$

$0$

$$seconds$.$ After completing the service at node

$1$

$,$

$$all the customers move to node

$2$

$$ for service and then to node

$3$

$$ for further service. After completing the service at node

$3$

$,$

$$the probability of return to the first node

$0$

$.$

$3$

$0$

$$ and the probability of exiting the network is

$0$

$.$

$7$

$0$

$.$

$$If W$1,$W$2,$W$3$

are the expected waiting time at nodes $1,2,3,$ respectively, then which one of the following is correct? A$.$W$1>$W$3>$W$2$

B$.$W$1>$W$2>$W$3$

C$.$W$2>$W$1>$W$3$

D$.$W$3>$W$2>$W