JavaBean standard question from Sierra's book

[Ismael Upright]

In Self Test of Chapter 1 in Sierra's book there is a question:

Which method names follow the JavaBeans standard?
A. addSize
B. getCust
C. deleteRep
D. isColorado
E. putDimensions

In Self Test Answers there is an info that B and D are correct but A, C and E are incorrect, because 'add', 'delete' and 'put' are not standard JavaBeans name prefixes.

The point is that in Chapter 1 [page 10 and 11] it is written that there are valid JavaBeans names with 'add' prefix.


My question is: are these answers and explanations to the question quoted above correct?

[P Ventura]

Javabeans prefix for methods are only get/set for getter and setters.
If a property is a boolean a getter can be is:
Example

class A{
private boolean b;
 
public boolean isB(){return b;}
}

[ahmed yehia]

The add, remove JavaBean prefixes are intended for adding and removing Listeners, thus must be appended by Listener name.

[Sundararaj Govindasamy]

add and remove are valid java bean prefixes while using with listeners only.
The explanation for the self test answer is wrong.