What type of risk management strategy did HAL Systems pursue by stopping public NTP services?

The choice of risk avoidance is appropriate because HAL Systems made a strategic decision to stop providing public NTP (Network Time Protocol) services as a means to eliminate the potential vulnerabilities and risks associated with those services. By discontinuing the public aspect of NTP, they effectively avoided the risk of exploitation or attack that could arise from their visibility on the internet.

In risk management, avoidance is a proactive strategy where an organization decides to remove a specific risk entirely by eliminating the causes or ceasing the activities that give rise to that risk. By avoiding the risk of potential exposure and threats that could stem from providing NTP services publicly, HAL Systems prioritizes the overall security posture of their systems and data. This is a fundamental aspect of effective risk management, as it helps to protect the organization from incidents that could arise from unmonitored or unsecured services.