What is the preferred method for a Jenkins administrator to notify nil Jenkins users about upcoming system maintenance?

What is the preferred method for a Jenkins administrator to notify nil Jenkins users about upcoming system maintenance?
A . Add text to the "System Message" field on the "System Configuration" page to populate a banner displayed across the top of the master’s home page.
B . On the "System Configuration" page, choose the "Maintenance Alerts" option from the "Alerts" dropdown menu and populate the box with a message to be added to all build logs.
C . Populate the "Email Notifications" section of the "System Configuration" page with a message to be sent as email to all registered Jenkins users.
D . On the master’s dashboard, dick "add description" or "edit description" to populate a banner displayed across the top of the master’s home page.

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Answer: B