A company must make a payment of $ 21,589 in ten years. The market interest rate is 8%. The company's portfolio manager wishes to fund the obligation using four-year zero-coupon bonds and perpetuities paying annual coupons. How can the manager immunize the obligation? Suppose that two years have passed, and the interest rate remains at 8%. Is the position still fully funded? Is it still immunized? If not, what actions are required