Question: In order for Angular to process components in an application, where do the component types need to be registered?

1. within a script tag in the index.html file
2. in an NgModule decorator metadata tag named _components_
3. No registration is needed simply include the component files in an app directory.
4. in an NgModule decorator metadata property named _declarations_

Answer: The correct answer of the above question is Option D:in an NgModule decorator metadata property named _declarations_