Answer: Install antivirus software, firewalls, and anti-spyware software on her computer.
Step-by-step explanation:
Marla's computer is the most likely place where people can gain access to her personal information for use to propagate identity theft. Personal computers have all sorts of personal information such as scanned copies of birth certificates, academic achievements, photographs, bank statements and the like. If the security on a personal computer is breached, it could be quite harmful.
For this reason Marla should install antivirus software, firewalls, and anti-spyware software on her computer to protect it from unwanted access from everyone including people who would use her information for the wrong reasons.