Consider the following statements: In a single-server queueing model
1. The arrivals is a memoryless process
2. The arrivals is described as a Poisson distribution
3. Uncertainty concerning the demand for service exists
Which of the above statements are correct?
(a) 1 and 2 only (b) 1 and 3 only
(c) 1, 2 and 3 (d) 2 and 3 only