Aa3 by Moody's or are rated "Aa3" by Moody's and such rating is on watch for possible downgrade (but only for so long as it is on watch for possible downgrade), or (C) either (i) the unsecured, short-term debt obligations of Party A (or its Credit Support Provider) are rated below "A-1" by S&P or (ii) if Party A (or its Credit Support Provider) does not have a short-term rating from S&P, the unsecured, long-term senior debt obligations of Party A (or its Credit Support Provider) are rated below "A+" by S&P (such event, a "Collateralization Event"), then, Party A, at its own cost and subject to the Rating Agency Condition, shall within 30 days either (i) cause another entity to replace Party A as party to this Agreement that satisfies the Swap Counterparty Ratings Requirement and that is approved by the Trustee (which approval shall not be unreasonably withheld) on terms substantially similar to this Agreement; (ii) obtain a guaranty of, or a contingent agreement of another person that satisfies the Swap Counterparty Ratings Requirement, to honor Party A's obligations under this Agreement, provided that such other person is approved by the Trustee such approval not to be unreasonably withheld; (iii) post collateral in accordance with a Credit Support Annex which satisfies the Rating Agency Condition; or (iv) establish any other arrangement satisfactory to the applicable Swap Rating Agency which will be sufficient to restore the immediately prior ratings of the Swap Certificates (determined without regard to any financial guaranty insurance policy, if applicable). All collateral posted by Party A shall be returned to Party A immediately upon Party A securing a substitute counterparty that satisfies the Swap Counterparty Ratings Requirement.