Set-builder notation is often more versatile and efficient than listing a set in roster form. This versatility is illustrated with the following two sets. 

A = {x|x ∈ N and x > 2}

B = {x|x > 2}

(a) Write a description of set A and set B.

(b) Explain the difference between set A and set B.

(c) Write set A in roster form.

(d) Can set B be written in roster form? Explain your answer.