In a certain code language, 'A + B' means 'A is the mother of B', 'A - B' means 'A is the father of B', 'A $ B' means 'A is the son of B', 'A% B' means 'A is the sister of B', 'A/B' means 'A is the wife of B' and 'A = B' means 'A is the brother of B'. Which of the following means B is the daughter of L?
I. B + L / K - Q = E
II. K % Q = L + B = E
III. L + B / Q - E % K
IV. E + L = B / Q - K