Which of the following represents the language corresponding to the regular expression r =(aa)* (bb)* b ?

1
L(r) = {a2nb2m+1 : n ≥ 1, m ≥ 1}
2
L(r) = {a2nb2m : n ≥ 0, m ≥ 0}
3
L(r) = {a2nb2m n ≥ 1, m ≥ 1}
4
L(r) = {a2nb2m+1  : n ≥ 0, m ≥ 0}
5
Question Not Attempted

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