Which command in DOS can be used to recover accidentally deleted files

Computer Programmer exam for Post Code 761 by HP Panchayati Raj was held on 01/11/2020 on various centres in Himachal Pradesh. Duration of exam 2 hours from 2:00 PM to 4:00 PM.
Total 170 questions were asked. Exam was f 85 marks so each question was carrying .5 marks.