When you define a subclass, like student, and don't supply a constructor, then its superclass must: 1. have no constructors defined2. have no constructors defined or have an explicit default (no-arg) constructor defined.3. have an explicit copy constructor defined4. have an explicit default (no-arg) constructor defined5. have an explicit working constructor defined

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a macro is a tool that allows you to automate tasks and add functionality to your forms, reports, and controls. for example, if you add a command button to a form, you associate the button's onclick event to a macro, and the macro contains the commands that you want the button to perform each time it is clicked.

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