The investment program may make any contract and execute any instrument that is necessary or convenient to provide financial assistance, including any: (1) Loan agreement, trust indenture, intercept agreement, or reimbursement agreement; (2) Acceptance of a pledge of project revenue, special assessment, user fee, tax increment, or other legally available revenue; (3) Requirement or funding of any reserve fund to secure repayment; or (4) Participation in any pooled financing or senior-subordinate structure.