The revision of a decision on which an action was predicated will be subject to the following sections:

(a) Clear and unmistakable error, §3.105(a) of this chapter;

(b) Difference of opinion, §3.105(b) of this chapter;

(c) Character of discharge, §3.105(c) of this chapter;

(d) Severance of service connection, §3.105(d) of this chapter;

(e) Veteran no longer totally and permanently disabled, §21.4135(o).