(c) The Board shall have power, and is hereby authorized from time to time, to also issue negotiable refunding bonds hereunder, to refund bonds at or prior to their maturity or which by their terms are subject to redemption before maturity, or both, in an amount necessary to refund (i) the principal amount of the bonds to be refunded, (ii) the interest to accrue up to and including the maturity date or dates, or to the next succeeding redemption date, thereof, and (iii) the applicable redemption premiums, if any. All proceeds received at the sale thereof (excepting the accrued interest received and an amount sufficient to pay the costs of issuance of such bonds and to create or maintain any reserves required under the resolution authorizing such bonds) shall be used: (1) if the bonds to be refunded are then due, for the payment thereof;(2) if the bonds to be refunded are voluntarily surrendered with the consent of the holder or holders thereof, for the payment thereof;(3) if the bonds to be refunded are then subject to prior redemption by their terms, for the redemption thereof;(4) if the bonds to be refunded are not then subject to payment or redemption, to purchase direct obligations of, or obligations which are fully guaranteed by, the United States of America so long as such obligations will mature at such time or times, with interest thereon or the proceeds received therefrom, to provide funds adequate to pay when due or called for redemption prior to maturity the bonds to be refunded, together with the interest accrued thereon and any redemption premium due thereon; and such proceeds or such obligations shall, with all other funds legally available for such purpose, be deposited in escrow with a banking corporation, or national banking association, located in and doing business in the State of Illinois, with power to accept and execute trusts, or any successor thereto, which is also a member of the Federal Deposit Insurance Corporation and of the Federal Reserve System, to be held in an irrevocable trust solely for and until the payment and redemption of the bonds so to be refunded; and any balance remaining in such escrow after the payment and retirement of the bonds to be refunded shall be returned to the Board to be used and held for use as revenues pledged for the payment of such refunding bonds; or(5) for any combination thereof. With respect to instruments for the payment of money issued under this Section, it is the intention of the General Assembly (i) that the Omnibus Bond Acts are supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Article that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Article that may appear to be or to have been more restrictive than those Acts.