What are the rules for resignation and reinstatement of an officer?

GS Paper 2: Topics Covered: Role of civil services.   Context: Indian Administrative Service (IAS) officer Shah Faesal, who resigned from the service in protest against the “unabated” killings in Kashmir in 2019, has been reinstated. Faesal’s resignation, in January 2019, had not been accepted by the government, pending investigation into some of his posts …