Task 1: Create a UML use case diagram given the use case descriptions below UC1: GetTime Actors Description Preconditions Flow of events: Client Models obtaining the current time from a central clock A network time service is available on the network 1. 2. 3. 4. 5. 6. Use case begins when the client opens a network connection to the server Server acknowledges a connection has been established Client requests the current time Client provides its current time zone, using the time zone name Server provides client with current time in the requested time zone Server closes the network connection Postconditions Client has the current time, all network connections are closed UC2: ListTimeZones Actors Description Preconditions Flow of events: Client Models obtaining descriptions of the approved time zones A network time service is available on the network 1. Use case begins when the client opens a network connection to the server 2. Server acknowledges a connection has been established 3. Client requests complete list of all time zones 4. For each recognized time zone, steps 4-6 are repeated 5. Server provides time zone name 6. Server provides time zone offset from UTC 7. Server provides a list of major cities which use the time zone Server closes the network connection 8. Postconditions Client has been given all recognized time zones, all network connections are closed