How are cached usernames and passwords cleared from the memory of a R76 Security Gateway?

How are cached usernames and passwords cleared from the memory of a R76 Security Gateway?
A . By using the Clear User Cache button in Smart Dashboard
B . By retrieving LDAP user information using the command fw fetch dap
C . Usernames and passwords only clear from memory after they time out
D . By installing a Security Policy

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Answer: D