7°
The State may exercise the options or discretions—
i to which Article 20 of the Treaty on European Union relating to
enhanced cooperation applies,
ii
under Protocol No. 19 on the Schengen acquis integrated into the
framework of the European Union annexed to that 25 treaty and to the
Treaty on the Functioning of the European Union (formerly known as the
Treaty establishing the European Community), and
iii under Protocol No. 21 on the position of the United Kingdom and
Ireland in respect of the area of freedom, security and justice, so
annexed, including the option that the said Protocol No. 21 shall, in
whole or in part, cease to apply to the State,
but any such exercise
shall be subject to the prior approval of both Houses of the
Oireachtas.