For the purposes of Regulation 121(1) -
(a) O-SIIs shall be identified in accordance with that paragraph,
(b) systemic importance shall be assessed on the basis of at least one of the following criteria:
(i) size;
(ii) importance for the economy of the Union or of the State;
(iii) significance of cross-border activities;
(iv) interconnectedness of the institution or group with the financial system.