In Cth v Tasmania (1983) known as Tasmanian Dam Case, the Federal government wanted to prevent the Tasmanian government from building a hydro-electric plant on Franklin river. The Commonwealth government therefore passed legislation prohibiting the project. The Tasmanian government challenged validity of legislation under Constitution. Select the correct statement.

1. The legislation was valid under s 51(xxix) ie external affairs power since Australia had ratified an international convention protecting environment

2. The legislation was valid under s 51(xxix) ie external affairs power since Australia had ratified an international convention protecting environment

3. The legislation was valid under the corporations power of s 51(xx).

4. The legislation was not valid under s 51(xxix) ie external affairs power