Which of the following statement(s) is/are found to be correct? I. Eighth schedule has a list of 22 regional languages recognised by the Constitution in which originally, there were only 14 languages in this schedule, the 15th language, Sindhi, was added by the 21st Constitution Amendment in 1967. II. Eleventh schedule lists 29 subjects on which the Panchayats have been given administrative control and was added to the Constitution on 20 April, 1992 by the 73rd Amendment in 1992. III. Twelfth schedule lists 18 subjects on which the municipalities are given administrative control and was added to the Constitution on 20 April, 1992 by the 74th Amendment in 1992.