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Which of the Following Is a Secondary Reinforcer

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Which of the following is a secondary reinforcer?


Definitions:

Interface

In programming, a contract or a set of methods that a class can implement to agree to behave in a certain way.

Extends

A keyword in Java and other programming languages used to inherit properties and methods from one class to another.

Implements

A keyword in many programming languages used to specify that a class is going to use the interface(s) declared methods.

CompareTo

A method typically defined in an object to compare itself with another object of the same type, often used for sorting.

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