You are given a super class called People and a sub-class (derived class) called Engineer. The sub-class (derived class) has a method called update(), but the super class does not have update() method. Which of the following is the correct use of update method?

Computer Networking: A Top-Down Approach (7th Edition)
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Chapter1: Computer Networks And The Internet
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Java
You are given a super class called People and a sub-class (derived class) called Engineer. The sub-class (derived class) has a
method called update(), but the super class does not have update() method. Which of the following is the correct use of
update method?
A) People a = new People(); ..; a.update();
People a = new Engineer(); ..; a.update();
C Engineer a = new People(); ..; a.update();
Engineer a = new Engineer(); ...; a.update();
Transcribed Image Text:You are given a super class called People and a sub-class (derived class) called Engineer. The sub-class (derived class) has a method called update(), but the super class does not have update() method. Which of the following is the correct use of update method? A) People a = new People(); ..; a.update(); People a = new Engineer(); ..; a.update(); C Engineer a = new People(); ..; a.update(); Engineer a = new Engineer(); ...; a.update();
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