5. (a) Knowledge of the Client's business is one of the important principles in developing an overall audit plan. In fact without adequate knowledge of client's business, a proper audit is not possible. As per SA-315, "Identifying and Assessing the Risk of Material Misstatement through Understanding the Entity and Its Environment", the auditor shall obtain an understanding of the relevant industry, regulatory and other external factors including the applicable financial reporting framework. Substantiate with the help of examples