For the purposes of regulation 137(a)(ii), the openable part of the window in the wall—
(a) must be not less than 2·4 m above the ground or paving immediately external to the window; or
(b) must be not less than 1·5 m above the floor of the room containing the window; or
(c) must have a catch, bolt, lock or other stop located not less than 1·5 m above the floor of the room containing the window so that the openable part of the window cannot be opened more than 125 mm; or
(d) must have a securely fitted fly screen.
Division 2—Maintenance and operation of barriers for swimming pools and spas