4. The Clarke Corporation requests that you build a software system (ClarkeSter) that allows customers to download free software. The software is stored in a decentralized manner, i.e., each customers computer can be used to store the software. The Clarke Corporation keeps a directory system of where all the free software is stored and the version of the software. The following use case described the actions performed by the user when they wants to download a software package.

Use case ClarkeSter_Download_001:

The customer visits the Clakesters homepage enters the name of the software package to be downloaded.

The system then searches the directory system supported by ClarkeSter and returns a list of software packages matching the name supplied and their version numbers.

The customer then selects the package to be downloaded by clicking on the package link. No link may be inactive.

The system then goes to the computer with the IP address associated with the link and starts to download the file.

When the download is complete, the system displays a message informing the customer.

The customer then acknowledges by clicking the OK button.

.

State any assumptions you make regarding the online store when answering the following questions.

(a) Draw a state machine diagram for the ClarkeSter_Download_001 use case. Use at most 8 states.