Sherif plans to retire in 17 years. He is saving $2000 every month in a retirement savings account paying him a long term interest rate of 9% compounded semi-annually until retirement. The rate changes following the retirement. He wants $7000 per month paid to him for 20 years AFTER the retirement. At what nominal interest rate should his savings accour pay him to fulfill his plans? O A.6.55% OB. 0.54% O C.3.28% O D.10.27%