Please answer the following using AT&T as the company

Model Assumptions and Inputs. In addition to the assumptions used for the forecasts, we require several additional inputs. - Weighted average cost of capital (WACC) is required to discount future amounts to derive present values. We can find estimates at a number of websites. Find the latest WACC at three or more sites and explore why they differ. One approach would be to use an average in the calculation and then perform sensitivity analysis for the high and the low in the range. - Net nonoperating obligations (NNO) and the book value of preferred stock are needed to determine the value of equity from total enterprise value. - Number of common shares outstanding. Recall that shares outstanding is equal to shares issued less treasury shares. The balance sheet typically reports both numbers but if not, we can find the amounts in the statement of shareholders' equity or in a foot