Which of the following is a common reason for considering a residential security system?

A family member being threatened or stalked is a significant and valid reason for considering a residential security system. This situation directly impacts personal safety and necessitates enhanced security measures to protect individuals from potential harm or harassment.

Installing a security system in response to such a threat provides an immediate and tangible method of ensuring safety, thereby offering peace of mind to those affected. It often involves measures such as surveillance cameras, alarm systems, and monitoring services that can alert authorities when needed, further addressing specific risks associated with threats or stalking.

While the other options may relate to residential security, they do not have the same urgency or critical focus on personal threat and safety. A recent security upgrade and changing home insurance are typically driven by proactive security management rather than immediate risk. The installation of a home automation system may enhance convenience or efficiency but does not necessarily prioritize security in response to personal threats.