Final answer:
Pre-action fire sprinkler systems commonly use a double interlock method for alarm verification, requiring two confirmations of a fire before water is released to prevent accidental discharge.
Step-by-step explanation:
The type of alarm verification commonly used with pre-action fire sprinkler systems is often referred to as a double interlock. This verification method typically involves a combination of a smoke or heat detector and a manual release, ensuring that water is only released into the piping of the sprinkler system following confirmation of a fire event from two separate sources. This minimizes the chance of accidental water discharge, which is crucial in areas where water can potentially damage valuable or sensitive materials, such as in data centers or museums.