(a) The Borrower agrees to pay to the Administrative Agent, for the account of each Lender having a Revolving Credit Commitment (in each case pro rata according to the respective Revolving Credit Commitments of all such Lenders), a commitment fee for each day from and including the Closing Date to but excluding the Final Date applicable to such Revolving Credit Commitment. Such commitment fee shall be payable for each Class of Revolving Credit Commitments quarterly in arrears (x) on the last Business Day of each fiscal quarter of the Borrower and (y) on the Final Date for such Class (for the period ended on such date for which no payment has been received pursuant to clause (x) above), and shall be computed for each day during such period at a rate per annum equal to the Commitment Fee Rate in effect on such day on the Available Commitment in effect on such day. Notwithstanding the foregoing, the Borrower shall not be obligated to pay any amounts to any Defaulting Lender pursuant to this Section 4.1(a).