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participates in DI compilation, and `@NgModule` defines a module.",{"id":170,"topic":9,"difficulty":153,"body":171,"options":172,"correct_key":160,"explanation":181},"019f79bd-8ff8-7e29-951d-bb25cb9c9474","In `@Component({ selector: 'app-user-card', ... })`, what does the `selector` property control?",[173,175,177,179],{"key":157,"text":174},"The component's routing path, used by the Angular Router to match URLs to this component",{"key":160,"text":176},"The custom HTML tag used to place the component in a template",{"key":163,"text":178},"The name of the component's exported TypeScript class, as written after the `class` keyword",{"key":166,"text":180},"The name of the `NgModule` (or standalone bundle) that declares and exports the component","`selector` defines the CSS-like selector (by default an element name) that other templates use to instantiate the component, e.g. `\u003Capp-user-card>\u003C\u002Fapp-user-card>`. It has nothing to do with routing, the class name, or module membership.",{"id":183,"topic":9,"difficulty":184,"body":185,"options":186,"correct_key":163,"explanation":195},"019f79bd-8ff9-7609-a0c2-e593e2086044",2,"```typescript\n@Component({ selector: 'app-child', template: `{{ name }}` })\nclass ChildComponent {\n  @Input() name!: string;\n}\n```\nParent template: `\u003Capp-child [name]=\"parentName\">\u003C\u002Fapp-child>`\nWhat does `@Input()` on `name` allow here?",[187,189,191,193],{"key":157,"text":188},"It lets `ChildComponent` emit a custom `name` event upward to whichever parent is listening for it",{"key":160,"text":190},"It lets `ChildComponent` inject a `name` value from a provider registered by the parent's injector",{"key":163,"text":192},"It lets the parent bind a value into `name` via property binding",{"key":166,"text":194},"It makes `name` automatically stay two-way synced between parent and child with no binding syntax at all","`@Input()` exposes `name` as a bindable property. The parent uses square-bracket property binding, `[name]=\"parentName\"`, to pass a value down one-way from parent to child.",{"id":197,"topic":9,"difficulty":153,"body":198,"options":199,"correct_key":166,"explanation":208},"019f79bd-8ff9-7e1b-a814-557d7f77fecb","Which class does Angular provide for a component to emit custom events, typically paired with `@Output()`?",[200,202,204,206],{"key":157,"text":201},"`Subject`",{"key":160,"text":203},"`BehaviorSubject`",{"key":163,"text":205},"`Observable`",{"key":166,"text":207},"`EventEmitter`","`@Output()` properties are conventionally typed as `new EventEmitter\u003CT>()`. 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