1. Contracting authorities shall require economic operators to explain the price or costs proposed in the tender where tenders appear to be abnormally low in relation to the works, supplies or services.

2. The explanations referred to in paragraph 1 may in particular relate to:

(a) the economics of the manufacturing process, of the services provided or of the construction method;

(b) the technical solutions chosen or any exceptionally favourable conditions available to the tenderer for the supply of the products or services or for the execution of the work;

(c) the originality of the work, supplies or services proposed by the tenderer;

(d) compliance with obligations referred to in Article 18(2);

(e) compliance with obligations referred to in Article 71;

(f) the possibility of the tenderer obtaining State aid.