This is one of the instances where BS7671 needs to be sorted out. Changing from EEBADS to ADS was a joke.
Both EEBADS and ADS are protective protective measures which according to BS7671 require both basic protection and fault protection.
Basic protection is provided by basic insulation of live parts, barriers, enclosures, obstacles or by placing out of reach.
Fault protection is provided by protective earthing, protective equipotential bonding and ADS.
So for the question if the protective measure ADS is being used, there should already be in place protective earthing and protective equipotential bonding. That’s answers 1, 2 and 3 out of the way.
Other measures for providing fault protection are:
(i) SELV
(ii) PELV
(iii) FELV
(iv) double or reinforced insulation and
(v) electrical separation.