Section 4S of the Principal Act is amended as follows:(a) by omitting from subsection (1) "Board" and substituting "Authority" ;(b) by omitting from subsection (3) "Board" and substituting "Authority" ;(c) by omitting from subsection (4) "Board" first occurring and substituting "Authority" ;(d) by omitting from subsection (4) "Board" second occurring and substituting "Authority" ;(e) by omitting from subsection (4)(d) "Board" and substituting "Authority" ;(f) by omitting from subsection (7) "Board" twice occurring and substituting "Authority" .