What must an administrator do to restrict any brute force attacks that attempt to gain access to the FortiWeb management GUI?

Refer to the exhibit.

There is only one administrator account configured on FortiWeb. What must an administrator do to restrict any brute force attacks that attempt to gain access to the FortiWeb management GUI?
A. Delete the built-in administrator user and create a new one
B. Configure IPv4 Trusted Host # 3 with a specific IP address
C. The configuration changes must be made on the upstream device.
D. Change the Access Profile to Read_Only

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