For each of the following pairs of securities, indicate which of the two you expect to have the shorter effective duration, or whether it is indeterminate. Assume any other attributes that are not mentioned (e.g., coupon, remaining maturity, credit risk) are similar across the two. The perspective is for a long position unless otherwise noted. (a) Indicate which of the two you expect to have the shorter effective duration, or whether it is indeterminate. (i) An interest only (10) security backed by a pool of 15-year non-callable level payment loans (ii) A principal only (PO) security backed by a pool of 15-year non-callable level payment loans (ii) indeterminate (a) Indicate which of the two you expect to have the shorter effective duration, or whether it is indeterminate. (i) A fixed rate mortgage with an estimated PSA of 220% (ii) A fixed rate mortgage with an estimated PSA of 350% (i) (ii) indeterminate