Select all true statements about the Java keyword "interface".

Question $21$ options:

Every method in an interface is abstract$.$

Interfaces are used to enforce commonality among the methods of a variety of different implementations.

Interfaces can be instantiated. In other words, "new" can be used to create a new object of the type of the interface.

If I have an interface named Container that I want a Box class to implement, I$\text{'}$d write "public class Box extends Container"

If I$\text{'}$m creating an interface named Container, the first line of Container.java would be "public interface Container"