(2)The assessment should be performed in the form of three alternative tests (‘ancillary activity tests’), which are based on the trading activity of the persons within the group. The tests should determine whether the persons within the group trade on own account. If those persons provide investment services in commodity derivatives, emission allowances or derivatives thereof in the Union to such a large extent relative to the main business of the group that those activities cannot be considered to be ancillary at group level, those persons should be required to obtain authorisation as an investment firm. In order to take account of the economic reality of the heterogeneous groups that have to undertake the assessment of whether their trading is ancillary to their main business activities, those persons should be allowed to decide which of the three alternative tests to perform in order to determine whether their trading activity is ancillary to the main business of a particular group. If a person’s trading activity is ancillary under any of those tests, it should be considered to be ancillary to the main business for the purpose of Article 2(1)(j) of Directive 2014/65/EU.