In this Act,
(a) a person or company who holds a sufficient number of the voting rights attached to all outstanding voting securities of an issuer to affect materially the control of the issuer, and, if a person or company holds more than 20 per cent of the voting rights attached to all outstanding voting securities of an issuer, the person or company is deemed, in the absence of evidence to the contrary, to hold a sufficient number of the voting rights to affect materially the control of the issuer, or
(b) each person or company in a combination of persons or companies, acting in concert by virtue of an agreement, arrangement, commitment or understanding, which holds in total a sufficient number of the voting rights attached to all outstanding voting securities of an issuer to affect materially the control of the issuer, and, if a combination of persons or companies holds more than 20 per cent of the voting rights attached to all outstanding voting securities of an issuer, the combination of persons or companies is deemed, in the absence of evidence to the contrary, to hold a sufficient number of the voting rights to affect materially the control of the issuer;