Public classes are accessible by all objects, which means that public classes can be or used as a basis for any other class.
a.
copied
b.
used
c.
saved
d.
extended

d.extended

Explanation:

The answer is d.

You usually has a top public class, for example, animals, with it's own attibutes. Then you can have other classes extending animals, for example, cats. These classes have both the attributes of the parent class, and their own attributes.

So the code goes something like this

public class Animals{

public Animals(){

\\constructor with attributes

}

\\code

}

public class Cats extends Animals{

public Cats(){

\\constructor with the extra attributes.

}

\\code

}

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maybe when you are listing people names in a job.

i am not 100% sure