Final answer:
The mandate from the intelligence community for passwords includes length and complexity requirements, and change frequency, but not the frequent sharing of passwords, which is a security risk.
Step-by-step explanation:
The intelligence community mandates for passwords include several guidelines designed to secure systems and data, but not all practices are recommended. Of the options listed, the practice that is NOT a mandate is c) Frequent sharing of passwords. Instead, passwords are meant to be confidential and only known to the authorized user.
Guidelines typically include:
- a) Length requirements: A minimum number of characters to ensure passwords are not easily guessable.
- b) Complexity requirements: To include a mix of upper and lower case letters, numbers, and special characters to increase the password's resilience against brute force attacks.
- d) Change frequency: Mandating the regular update of passwords to reduce the risk of compromised credentials being used over an extended period.