A business analyst has identified that one of the use cases on a use case diagram contains a large amount of optional processing. This optional processing is so large that he has decided to remove it to a separate use case which can be called by the original use case if required. How should the original use case be linked to the new use case?
The entity relationship model below shows the relationship between Product and Order. Which of the following business rules is correct and is reflected in the diagram?

Every night, at midnight, a system automatically raises invoices for customers that have placed orders that day. The invoice is sent electronically by email to customers. What is the event that triggers the production of invoices?
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