Which modifier is used to build classes on top of classes that are interfaces?

A) private
B) public
C) new
D) implements

Implements

A keyword in Java used to indicate that a class is using an interface, requiring the class to provide implementations for the interface's methods.

Modifier

In programming, a modifier is a keyword that you add to those definitions to change their meanings. Java language has a wide variety of modifiers, including those that define access control levels or provide characteristics such as being abstract or static.