18. If, according to an Act or an applicable statutory instrument, the act that may be performed respecting those matters and subjects is under the authority of a municipal council or an executive committee, the central municipality performs the act in the first case through its council provided for in Chapter I of Title IV and, in the second case, through that council or its executive committee, depending on what is specified in the order made under section 135.
That council is designated as an “urban agglomeration council”.