Where the branch agreement or the agreement only concerns professional journalists and persons treated as such, its validity is subject to its being signed by one or more representative employee trade union organisations which, in the elections taken into account for the measurement of the audience provided for in 3° of Article L. 2122-5, at least 30% of the votes cast in the college of journalists in favour of organisations recognised as representative at this level, whatever the number of voters, and in the absence of opposition from one or more representative employee trade union organisations having received the majority of the votes cast in this college at these elections, whatever the number of voters.