Electromagnetically Locked Egress Doors

Question 1
According to the 2009 edition of the International Building Code (IBC) the section entitled Electromagnetically Locked Egress Doors requires which of the following means of unlocking a door equipped with a mag-lock?
Motion sensor
Emergency push button
Fire alarm release
Door-mounted release device
Answers A, B, and C
Answers A, B, C, and D
Question 1 Explanation: 

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