(a)
Any person who, on September 17, 1965, was serving in a position as business manager and had been assigned a title listed in Section 35028 shall be deemed to be an employee in a position requiring certification qualifications for so long as he holds such position in the same district.
(b)
Any person who, on March 4, 1972, was serving in a position of business manager and that position had been declared, by the governing board, to be one requiring certification qualifications in accordance with the authority extended in this section prior to March 4, 1972, shall be deemed to be an employee in a position requiring certification qualifications for so long as he holds such position in the same district.
(c)
Except as provided in subdivision (d), on and after March 4, 1972, no person employed in a position of business manager shall be required to be credentialed and no title assignment, work, duty statement or other device, including but not limited to educational or other requirements of applicants, which may be established by the governing board, may be construed to require certification qualifications for any such position or reasonably related position.
(d)
The governing board of any school district with less than 3,000 units of average daily attendance in the prior fiscal year may require any person employed in a position of business manager to be credentialed.