1. Which of the following are sets? Justify your answer.(a) The collection of all the days in a week beginning with the letter ‘T’.(b) The collection of all difficult questions in the chapter on sets.(c) The collection of girls in your class.(d) The collection of all rivers in India.(e) The collection of all active teachers in the school.(f) The collection of all integers more than -3.(g) The collection of all beautiful flowers in the park.2. Write the following sets in the roster form.(a) A = The set of all even numbers less than 12(b) B = The set of all prime numbers greater than 1 but less than 29(c) C = The set of integers lying between -2 and 2(d) D = The set of letters in the word LOYAL(e) E = The set of vowels in the word CHOICE(f) F = The set of all factors of 363. Write each of the following in set builder form.(a) A = {5, 10, 15, 20}(b) B = {l, 2, 3, 6, 9, 18}(c) C = {P, R, I, N, C, A, L}(d) F = {0, 1, 2, 3, , 19}(e) H = {Jan, June, July}(f) I = {a, e, i, 0, u}