What does $$Centralised Collective Bargaining$$ entail?

Group of answer choices

Centralised bargaining in a national forum where trade unions engage with an employer whose ownership may include one workplace or several workplaces spread over various sites in a region or the country.

Centralised bargaining in a national forum with participation from the top national business federations and trade union federations with membership spanning numerous economic sectors$.$

Centralised negotiating in a national or regional sectoral bargaining forum with employer groups and labour unions active in particular economic sectors$,$ including manufacturing and services.

Centralised bargaining at the corporate or enterprise level, in which labour organisations bargain with a business owner who may have control over a single workplace or a number of workplaces spread over various regional or national locations.