Which of the following denitions applies to the derived demand method of forcasting? 0 It comprises a group of experts who are encouraged, in a relatively unsthctured atmosphere, to speculate about future developments in particular areas and to identify possible courses of action. 0 It is a method of generating ideas. There are different approaches but a popular one is for a number of people {no fewer than six, no more than fifteen) drawn from all levels of management and expertise to meet and propose answers to an initial single question posed by the session leader. 0 It involves analysing some aspects of economic activity so that the level of other aspects can be deduced and projected. The principle is simple, but the practice is complex and costly. 0 It seeks to avoid the group pressures to conformity that are inherent in the think tank method. It does this by individually. systematically and sequentially interrogating a panel of experts