Which of the following groups are considered part of the informal sector?

Explanation

The informal sector encompasses a wide range of participants including I - artisans, small-scale industrialists, and small shop owners; II - waste collectors, unlicensed taxi drivers, and repair workers; III - self-employed individuals; and IV - activities characterized by minimal capital, limited skills, and low barriers to entry. Therefore, all groups I, II, III, and IV are part of the informal sector.