The Secretary may invest money in the Crown Reserves Improvement Fund--
(a) if the Department is a GSF agency for the purposes of Part 6 of the Government Sector Finance Act 2018 --in any way that the Department is permitted to invest money under that Part, or
(b) if the Department is not a GSF agency for the purposes of Part 6 of the Government Sector Finance Act 2018 --in any way approved by the Treasurer.