Which of the following diagrams indicates the best relation between Mammal, Cow and Bat?

Rasagulla is one of the sweets while apple is different from these.

Football, Players and Field all are different.

Oil and Wick are different from each other but they both are used in lamp.

Men and Women are different from each other but some men may be teachers and some women may be teachers.

Some doctors may be professors and vice-versa.

Some professors may be men and vice-versa.

Some doctors may be men and vice-versa.

Some doctors may be men and professors as well.

Paper and Ink are different from one another but both these belong to stationery.

Cup is used to drink something with the help of lips. Similarly birds collects grass with the help of beak to make her nest.

As Water of a River flows similarly water of Pool is Stagnant.

As cat has Paw similarly Horse has Hoof.

As Ornithologist is a specialist of Birds similarly Archealogist is a specialist of Archealogy.