A large company consists of 10,000 employees, and an infrastructure needs to be created to broadcast messages to all the employees. If an AMPS system is to be used for such a broadcast, what may be the possible alternate scheme if 

(a) All employees are located in the same city?
(b) Fifty percent of employees are in one location, while the remaining 50% are in another place?
(c) Twenty-five percent of employees are located in four different locations?
(d) People are spread all over the world?