Review the external event checklist in Figure and think about a university course registration system. What is an example of an event of each type in the checklist? Name each event using the guidelines for naming an externalevent.

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Pretan Change Fawar Don't worry much about these until the User wants to log on to the system User wants to change the password Userwants to change preference settings design phase Back up éatabase Charge Patentr YV System crash requires database recovery Time to back up the database Time to require the user to change the password