1. The Commission may adopt a decision imposing on undertakings, including gatekeepers where applicable, and associations of undertakings periodic penalty payments not exceeding 5 % of the average daily worldwide turnover in the preceding financial year per day, calculated from the date set by that decision, in order to compel them:
(a) to comply with the measures specified by the Commission in a decision adopted pursuant to Article 8(2);
(b) to comply with the decision pursuant to Article 18(1);
(c) to supply correct and complete information within the time limit required by a request for information made by decision pursuant to Article 21;
(d) to ensure access to data, algorithms and information about testing in response to a request made pursuant to Article 21(3) and to supply explanations on those as required by a decision pursuant to Article 21;
(e) to submit to an inspection which was ordered by a decision taken pursuant to Article 23;
(f) to comply with a decision ordering inter
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