The minimum requirements for a services credential in a specialization in clinical or rehabilitative services are:
(a) A baccalaureate degree or higher degree from an institution approved by the commission.
(b) A fifth year, or its equivalent, of college or university education.
(c) Such specialized and professional preparation as the commission may require.
The services credential with a specialization in clinical or rehabilitative services shall authorize the holder to perform, at all grade levels, the service approved by the commission as designated on the credential. Clinical or rehabilitative services which may be designated by the commission include, but need not be limited to, speech, language, and hearing services.