1.1, practically always.
Simply because if an alarm is appropriate for the “Supervisory Control” aspect of SCADA, you typically care only about that Supervisor’s knowledge of the alarms.
When an application is strictly the “Data Acquisition” aspect of SCADA, there typically is no live machine interface other than review of the recordings. Operating such machines is strictly from the machine’s vendor-supplied HMI, where all the alarms are handled.
In a more blended environment you might echo such alarms to management, but handling the alarm happens on the plant floor. An ack from management is distinct from an ack from the machine operator, and shouldn’t be synchronized anyways.