It is define as a family of algorithms, encapsulates each one and makes them interchangeable. This lets the algorithm vary independently from clients that use it.

Stragey Pattern Correct
None of the Choices
Decorator Pattern
Observer Pattern

Similar CS-6203 questions

It is a type of pattern that ensures a class has only one instance and provide a global access point...
It is common to all the instances (or objects) of the class because it is a class level variable.
It belong to the class instead of a specific instance, this means you can access it without object.
It is a good practice to name final variable in all CAPS.
It can access class variables(static variables) without using object(instance) of the class.
It is used for initializing the static variables.