Disgruntled employees can be a significant source of problems for any company as we indicate in this problem. Andi Boyd is a very accomplished computer programmer, but she had a grudge against the company because she did not get a promotion that she thought she deserved. She decided to take out her anger on the company by coding a special routine in the mortgage loan program that erased a small, random number of accounts on the disk file every time the program was run. The company did not detect this malicious code until nearly half of all of the mortgage records were erased. In your opinion, what controls should the company have implemented to mitigate such a problem?