Provisions of NEP-2020 are - a. PTR under 30:1 will be ensured at the level of each school. b. Areas having large numbers of socio-economically disadvantaged students will aim for a PTR under 25:1. c. PTR means Pupil-teacher ratio. d. New pedagogical and curricular structure is 5+3+4+3. Choose the most appropriate answer from the options given below: