39. Notwithstanding subparagraph 2 of the first paragraph of section 38, an optional component may be substituted for a basic component where the former appears in the description of the device under the heading “Basic and Optional Component(s)” or on an exclusive list of components in the Tariff.
O.C. 612-94, s. 39; O.C. 1334-98, s. 15; Decision 001-2009, s. 21.