Which of the following statements about Scheduled Castes and Scheduled Tribes in India are accurate?
I. The terms "Scheduled Castes" and "Scheduled Tribes" are constitutionally defined.
II. Scheduled Tribes are primarily concentrated in urban areas.
III. Scheduled Castes have historically faced social exclusion and discrimination, including untouchability.
IV. Government policies aim to address the inequalities faced by Scheduled Castes and Scheduled Tribes.