questions regarding with ARENA.

in some cases it is needed to add a logic to the simulation models such that entities migh wait for unknown period of time before keep moving in the system. How can you add this logic to your model? Write the module names that you include your model? $(15$p$)$

What is the easiest way in ARENA to define too many different types of entities if you need to use just one create in your model? $(10$p$)$

c$)$ What is your Project topic? What are the advantages and disadvantages of ARENA software white you prepare your Project? Relate them with your topic.