An election of a health and safety representative for the designated work group may be conducted:
(a) if there is only one involved union in relation to the group--by that involved union; or
(b) if there is more than one involved union and all the involved unions are in agreement that a specified one of those unions should conduct the election--by that specified union; or
(c) if there is no involved union in relation to the group--by a
person authorised by the Authority to conduct elections under this section.