* Each of the following `Config` classes should have a class-signature annotation of `@Configuration`
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* this annotation tells spring to scan for `@Bean` definitions within the scope of the class, and register them to the [IOC Container](https://www.tutorialspoint.com/spring/spring_ioc_containers.htm) for `Inject` and `Autowire` use later.
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* Classroom should define getters for each of its fields.
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-* **Tip:** if testing fails, begin researching and attempting to use the `@Qualifier` annotation.