Formulate the optimal budgetary model for the following data and four considerations: i) Projects 1 and 3 must be undertaken together, if at all. ii) At most four projects may be undertaken. iii) Projects 4 and 5 are mutually exclusive. iv) Project 4 cannot be undertaken unless project 2 is undertaken. Formulate the optimal budgetary model for the following data and four considerations: i) Projects 1 and 3 must be undertaken together, if at all. ii) At most four projects may be undertaken. iii) Projects 4 and 5 are mutually exclusive. iv) Project 4 cannot be undertaken unless project 2 is undertaken