Which new law book has a black cover?

[Q.23 - 25] Read the following information carefully to answer the questions.

There are six books kept in a shelf and are labelled as L, M, N, O, P and Q. M, P, N and Q have brown covers while others have black covers. L, M and O are new volumes while others are old. L, M and N are computer books while the rest are law books.