Read the following passage and select the most appropriate answer. Nine books are to be arranged from the left to right on a shelf. Of these, four books are leather-bounds, three are cloth-bounds and remaining books are paperbacks. The leather bound books must be together. The paperback books must also be together. The cloth bound books need not to be together. The cloth-bound books must be next to each other, if a paperback book is in which the following position?