20. Which of the following is not an application control? a. input controls b. processing controls c. general and administrative controls d. output controls 21ich of te- llowd ie inermal comro n a compuer ysean? a. backup of all files b. limited access to computer programs c. programmers not operating the computers d. frequent management overrides 22. A sales clerk enters a customer's six-digit customer account. The computer program uses the first five numbers to calculate a sixth number. This resulting number is then compared to the sixth number entered by the sales clerk. This is an example of a. valid character test b. missing data test c. reasonableness test d. check digit