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In its $2009$ decision CITIZENS UNITED v$.$ FEDERAL ELECTION COMMISSION, the US Supreme Court ruled that $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.$

The US constitution protected the $$right to marry.$$

The federal government cannot limit corporate independent expenditures used in campaigns for or against candidates or causes.

Freedom of speech, now applied to corporations and their subsidiary $$political action committees$$ and was guaranteed by the first amendment of the United States Constitution.

Corporations and unions may establish a political action committee $($PAC$)$ for express advocacy or electioneering communications purposes.