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B) I know that lots of IT personnel wear pagers since they need to receive one-way messages sent by a machine to report downtime, and you don't really need to respond with "OK, hang on - I'm on my way!"
Not quite - you're thinking of older versions. Modern versions of Peakflow are teamed with TMS (Threat Management System), which allow you to mitigate DDoS attacks.
From their website, "Surgical Mitigation Arbor Peakflow SP TMS enables you to automatically detect and surgically remove only the attack traffic while maintaining legitimate business traffic â" thereby ensuring the highest level of customer satisfaction."