To use an Apex interface within a class, the class must implement the interface using theimplementskeyword.
This is the correct way to inherit behavior defined in an interface.
Example:
public class SilverLaptop implements Laptop {
// Implementation of the methods defined in the Laptop interface
}
Why not other options?
B: Theextendskeyword is used for inheriting from a class, not implementing an interface.
C: This syntax is incorrect and not supported in Apex.
D: This syntax is also incorrect as interfaces are not referenced with an@Interfaceannotation in Apex.
Apex Interfaces Documentation