What should a network engineer do to prevent unauthorized users from using the root user account?

A.
Reset the nsroot account.

B.
Change the nsroot password.

C.
Create an authorization policy.

D.
Bind a policy to the root user account.

Explanation:
Changing the Password of the Default User Account
The default user account provides complete access to all features of the Citrix SDX appliance.
Therefore, to preserve security, the nsroot account should be used only when necessary, and only
individuals whose duties require full access should know the password for the nsroot account. Citrix
recommends changing the nsroot password frequently. If you lose the password, you can reset the
password to the default by reverting the appliance settings to factory defaults.
You can change the password of the default user account in the Users pane. In the Users pane,
you can view the following details:
Name Lists the user accounts configured on the SDX appliance. Permission Displays the
permission level assigned to the user account.
To change the password of the default user account On the Configuration tab, in the navigation
pane, expand System, and then click Users. In the Users pane, click the default user account, and
then click Modify. In the Modify System User dialog box, in Password and Confirm Password, enter
the password of your choice.
Click OK.