(a) A board may grant a classification into Class 2-D until the end of the academic school year.

(b) Upon the expiration of a 2-D classification, a board shall review any request for extension of the classification in the same manner as the first request for Class 2-D. This section does not relieve a registrant of his duties under § 1621.1 of this chapter.

(c) The board may deny a claim for Class 2-D when the evidence fails to merit any of the criteria established in this section.