Your grandfather is turning 71 and he must deregister his remaining RRSP funds of $200,000 this year. Both your grandparents are in good health and they have enough income from your grandfather's current monthly RRIF payments to meet their expenses. He would like to minimize the tax burden of this withdrawal, and enjoy some growth potential while keeping the principal safe. He would also like to have some liquidity in the event of an emergency. He knows you are taking a personal finance course and asks for your advice. How would you advise him? Explain your rationale.