1. Where the implementation of recommendations referred to in Article 17a of this Regulation has not been completed, the verifier shall assess the operator's evidence and check whether:

(a) the energy efficiency recommendations referred to in Article 22a(1), second subparagraph, point (f), of Delegated Regulation (EU) 2019/331 were not issued in the first four years of the baseline period;

(b) recommendations would not lead to energy savings within the system boundaries of the industrial process carried out at the installation;

(c) the pay-back time referred to in Article 22a(1), second subparagraph, point (a), of Delegated Regulation (EU) 2019/331 exceeds three years;

(d) the installation specific operating conditions, including planned or unplanned periods of maintenance, upon which the pay-back period was determined have not yet occurred;

(e) the investment costs of the recommendations exceed the thresholds listed in Article 22a(1), second subparagraph, point (b) of Delegated Regulation (EU) 2019/331;

(f) other measures have been implemented during or after the relevant baseline period which led to greenhouse gas emission reductions equivalent to those recommended by the energy audit report or a certified energy management system for the installation.