Which of the following are sets? Justify your answer.
a. The collection of all the months of a year beginning with the letter J.
b. The collection of ten most talented writers of India.
c. A team of eleven best-cricket batsmen of the world.
d. The collection of all boys in your class.
e. The collection of all natural numbers less than 100.
f. A collection of novels written by the writer Munshi Prem Chand.
g. The collection of all even integers.