What internal control procedure(s) would be most effective in preventing the following errors or fraudulent acts? a) An inadvertent data entry error caused an employees wage rate to be overstated in the payroll master file. b) A fictitious employee payroll record was added to the payroll master file. c) During data entry, the hours worked on an employees time card for one day were accidentally entered as 80 hours, instead of 8 hours. d) A computer operator used an online terminal to increase her own salary. e) A factory employee punched a friends time card in at 1:00 P.M. and out at 5:00 P.M. while the friend played golf that afternoon. f) A programmer obtained the payroll master file and increased his salary. g) A large portion of the payroll master file was destroyed when the disk pack containing the file was used as a scratch file for another application.