The Authority may invest money in the Workers Compensation Operational Fund that is not immediately required for the purposes of the Fund--
(a) if the Authority is a GSF agency for the purposes of Part 6 of the Government Sector Finance Act 2018 --in any way that the Authority is permitted to invest money under that Part, or
(b) if the Authority is not a GSF agency for the purposes of Part 6 of the Government Sector Finance Act 2018 --in any way approved by the Minister with the concurrence of the Treasurer.