Which among the following Article states that there should be no discrimination on grounds of caste, religion, race, sex, place of birth?

Which among the following Article states that there should be no discrimination on grounds of caste, religion, race, sex, place of birth? [SSC CAPF’s ASI & Delhi Police SI Exam 04/07/2017, Shift I]

          a) Article 15

          b) Article 21

          c) Article 25

          d) Article 30