Answer to Question #42825 in Math for Sujata Roy

Question

Let L be a language given by L = {a^n b^n : n ≥ 0 } , then
L2 is equal to
a) { a^n b^n a^m b^m :n ≥ 0,m ≥ 0 }
b) { a^n b^n :n ≥ 0 }
c) { a^n b^n a^n b^n :n ≥ 0 }
d) none of these.