Whats the option is correct A,B,C or D

Only the answer without explain

Question 13 Which one of the following will not increase the operating cash flow as computed using the tax shield approach? OI. Increase in fixed costs O II. Decrease in variable costs O III. Increase in depreciation O IV. Decrease in fixed costs O V. Increase in sales Moving to another question will save this response. Question 14 The addition of a risk free security to a fully diversified portfolio: 01. must decrease the portfolio's expected return. O II. will increase the unsystematic risk of the portfolio. O II. must increase the portfolio beta. O IV. will have no effect on the portfolio beta or its expected return. O v. may or may not affect the portfolio beta