the Federal National Mortgage Association, or a Federal Home Loan Bank. (E) International bonds, which may not make up more than 10 percent of the total investments of the Trust Fund. (F) Corporate bonds, which may not make up more than 10 percent of the total investments of the Trust Fund. (3) Investment requirements (A) Ratings The investments of the Trust Fund shall consist— (i) only of investments rated at least Baa1 or BBB+ by Moody’s, S&P, or Fitch Ratings