(1)  An enterprise agreement may be made between any employer and any one of the following:

(a) one or more employee organizations representing persons employed in the enterprise;

(b) each of at least 60% of the individuals employed in one or more classes of employment in the enterprise;

(c) an employee committee formed under this Part to represent persons employed in the enterprise;

(d) any other person employed in the enterprise who is not included in paragraph (a) , (b) or (c) .

(2)  Subject to section 61ZD (1A) , before employees or an employee committee can become a party to an enterprise agreement, the proposed agreement must be approved in a secret ballot by at least 60% of the persons employed in the enterprise in the one or more classes of employment to which the agreement is to apply.