The plan or program for funding the grant by the authority to a local public body for a project may be any one or more of the following, as shall be approved by the authority:
The undertaking of the local public body may be payable solely from, and limited to, one or more of the sources specified in paragraphs a, b or c of this subdivision, or it may be a general obligation of the local public body additionally secured by a pledge of one or more of such sources.
Ala. Code § 22-29-20 (1975)