What are standardization action to comply with art. 42 of GDPR?

Article 42 of EU Regulation 679/16 on Data Protection states: ” The Member States, the supervisory authorities, the Board and the Commission shall encourage, in particular at Union level, the establishment of data protection certification mechanisms and of data protection seals and marks, for the purpose of demonstrating compliance with this Regulation of processing operations by controllers and processors.

Source: What are standardization action to comply with art. 42 of EU Regulation 679/16?