Even not knowing for sure if there's a "System Upgraded" notification out of the box, I would go with B - First of all notifications are available in System Notification -> E-mail -> Notifications (so that rules out A), second of all why would the administrator want to send a notification for a completed upgrade (through a Client Script or a Business Rule) to himself? That rules out C and D. So B is the only plausible one.
But to confirm my logic I also went in and checked in my out of the box personal development instance and there is indeed a "System Upgraded" notification in System Notification -> E-mail -> Notifications
There is a "System Upgraded" notification. Head to System Notification -> Notification and type "*upgrade" in the name, you will see the "System Upgraded" Notification.
For the Exam I would choose A
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