Final answer:
To safeguard against insider threats, it is crucial to establish a strong access control system, therefore the correct answer is option b.
Step-by-step explanation:
To protect against insider threats, it is important to implement a strong access control system. This includes measures such as two-factor authentication, strong passwords, and limiting access to sensitive information only to those who need it.
Ignoring potential signs of insider threats is not recommended. It is crucial to be vigilant and monitor for any suspicious activities or behaviors that may indicate an insider threat.
Using the same password for all systems is also not recommended, as it increases the risk of unauthorized access. It is best to use unique and complex passwords for each system or account.