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What is the use of Observable class?

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What is the use of Observable class?

(a) It is used to create global subclasses

(b) It is used to create classes that other part of the program can observe

(c) It is used to create classes that can be accessed by other parts of program

(d) It is used to create methods that can be accessed by other parts of program

The question was asked by my college director while I was bunking the class.

I need to ask this question from Observable & Timer Class topic in portion java.util – More Utility Classes of Java

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Right answer is (b) It is used to create classes that other part of the program can observe

Explanation: The Observable class is used to create subclasses that other part of program can observe.

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