a) A = {prime numbers B = b) B = {letters of the word 'elephant'} C c) C = {x:xis an odd number less than 5} d) D = {y : y is a factor of 12} D = Creative Section 5. Let's answer the following questions. a) What is a set? Give an example of a set. b) Is the collection of nice Nepali songs a set? Why? c) Write three methods of writing sets. Give one example of each d) How do we write a set in set-builder method? Let's write the following membership or non-membership b notation symbols. Example: (i) 4 belongs to the set W. 4 E W (ii) b is not a member of {a, e, i, o, u}.b & {a, e, i, o, u​