21.5. A share of a class of the capital stock of a corporation is a term preferred share of the corporation if one of the following conditions is met:(a) the share was issued or acquired after 28 June 1982 and, at the time the share was issued or acquired, the existence of the corporation is, or there is an existing agreement under which it could be, limited;
(b) it is issued after 16 November 1978, the owner thereof acquired it after 23 October 1979 and is a corporation, trust or partnership described in section 21.5.1 that, either alone or together with any such corporations, partnerships or trusts, controls or has an absolute or contingent right to control or to acquire control of the corporation;
(c) it is issued after 16 November 1978 and, under its terms or conditions, an agreement in respect of the share or a modification of such terms or conditions or such agreement, either in the case of a share issued after 16 November 1978 and before 13 November 1981, or after 12 November 1981 and before 1 January 1983 pursuant to an agreement in writing to do so made before 13 November 1981, the share is convertible, directly or indirectly, into debt or into a share that would, if issued, be a term preferred share, and in any other case, the share is convertible or exchangeable, unless it is convertible into or exchangeable for a consideration described in section 21.5.5, or one of the provisions described in section 21.5.2, 21.5.3 or 21.5.4 applies.