Which of the following groups is considered "outside" the caste system - formerly known as "untouchables?" Kshatriya Shudra Brahman Dalits

Shudras were considered as untouchables in the previous time in India. The people of these communities belonged to lower castes and were responsible for jobs of janitors, cobblers, etc. They are the fourth varna of the social class system, and now are classified under Scheduled tribes and scheduled class benefit systems.