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? O a. People a = new People(); ...; a.update(); O b. Engineer a = new Engineer(); ...; a.update(); Oc People a = new Engineer(); ..; a.update(); O d. Engineer a = new People(); ....; a.update();

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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data structures in 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?
O a. People a = new People(); ...; a.update();
O b. Engineer a = new Engineer(); ...; a.update();
O. People a = new Engineer(); ...; a.update();
O d. Engineer a = new People(); ....; 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? O a. People a = new People(); ...; a.update(); O b. Engineer a = new Engineer(); ...; a.update(); O. People a = new Engineer(); ...; a.update(); O d. Engineer a = new People(); ....; a.update();
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