In this Part business includes whether carried on by 1 person or 2 or more persons together;(a) a profession or trade; and(b) any other activity carried on for fee, gain or reward; and(c) the activity of employing one or more persons who perform duties in connection with another business; and(d) the carrying on of a trust (including a dormant trust); and(e) the activity of holding any money or property used for or in connection with another business group means a group constituted under this Part, but does not include any member of the group in respect of whom a determination under Division 4 is in force.