An interface and all of its method headings are normally declared to be:

A) public
B) private
C) protected
D) package access

Interface

A programming construct that defines a contract of methods that a class needs to implement without providing a concrete implementation.

Method Headings

The part of a method declaration in programming that specifies the method's name, return type, and parameters, but not the body.

Public

An access modifier in programming languages that allows members (variables, methods, classes) to be accessible from any other code in the application or any external class.