3. The Commission may attend, without the right to vote, the meetings of the PRB, with the exception of the final deliberations of the PRB for the adoption of its opinions, recommendations, reports and guidance material. The relevant stakeholders referred to in Article 49(3) may be invited, without the right to vote, to the meetings of the PRB, with the exception of the final deliberations of the PRB for the adoption of its opinions, recommendations, reports and guidance material, on an ad hoc basis.