Why might discounted cash flow valuation be difficult to do for the following types of firms? A private firm, where the owner is planning to sell the firm. A biotechnology firm, with no current products or sales, but with several promising product patents in the pipeline. A cyclical firm, during a recession. A troubled firm, which has made significant losses and is not expected to get out of trouble for a few years. A firm, which is in the process of restructuring, where it is selling some of its assets and changing its financial mix. A firm, which owns a lot of valuable land that is currently unutilized.