Explanation:

A Legislation can be said to be a ‘Colourable legislation’ if and only if a legislature having no power to legislate on a specific matter frames a legislature in such a manner as to make it seem to fall within its own jurisdiction. In this case the state tries to hide the real objective of an Act and tries encompass it with something over which the legislature has jurisdiction which means those Legislations which cross the Constitutional limits of a particular legislature. Hence option 4th is correct.