Go with the correc answer and there are lot of printing mistakes in the study material. ICAI has correct answers in the papers that are corrected (in this case by the OMR). You should darken the answer that is correct. i.e. the option which is chosen as answer in Mock Test Papers. As regards BOS, it is taking the necessary steps in the same. It had done commendable job by issuing study material and mock test papers in short time. Good Luck for 4/11/07.