7. Which of the following statements is false? Choose the best answer! (a) All mean-variance efficient portfolios should have the same Sharpe ratio as the tangent portfolio (b) Adding a new asset which has negative correlations with the existing assets would shift mean- variance frontier to the left (c) Regardless of their risk aversion, investors should allocate their wealth between a risk-free asset and the tangent portfolio (d) Regardless of their risk aversion, investors should allocate their wealth between a portfolio of corporate bonds and the tangent portfolio