Public class Example0 {
public void doNothing(Example1 b, Example2 c)
{
}
}
public class Example1 extends Example0
{
}
public class Example2 extends Example1
{
}
the following initializations appear in a different class
Example0 e0 = new Example0();
Example1 e1 = new Example1();
Example2 e2 = new Example2();
which of the following is a correct call to doNothing
Choices:
e0.doNothing(e0, e0);
e1.doNothing(e1, e1);
e1.doNothing(e2, e1);
e2.doNothing(e0, e0);
e2.doNothing(e2, e2);​

Implement a document scanning function wordcountengine, which receives a string document and returns a list of all unique words in it and their number of occurrences, sorted by the number of occurrences in a descending order. if two or more words have the same count, they should be sorted according to their order in the original sentence. assume that all letters are in english alphabet. you function should be case-insensitive, so for instance, the words “perfect” and “perfect” should be considered the same word.