भारत में पहली बार केंद्रीय लोक सेवा आयोग की स्थापना किस वर्ष की गई थी?

In the lead-up to a significant institutional milestone, a constitutional body has announced plans to establish a knowledge center dedicated to collecting and sharing best practices. Which constitutional body has proposed establishing a Centre of Excellence as part of its centenary year celebrations (2025-2026)?

Arrange the following Chairmen of the Finance Commission of India in chronological order based on their historical periods/sequence of appointment, from earliest to latest: (A) A. M. Khusro (B) N. K. Singh (C) Vijay Kelkar (D) N. K. P. Salve