Question: For a location covering problem to find the minimum number of fire stations that will assure a response time of no more than 5 minutes,

For a location covering problem to find the minimum number of fire stations that will assure a response time of no more than 5 minutes, you have the following matrix of inter-district travel times (minutes). If Xi is a binary decision variable denoting whether or not the ith district gets a fire station, what is the correct specification for the constraint that there must be at least one fire station that can reach District1 within 5 minutes?

	District1	District2	District3	District4
District1	0	2	10	6
District2	2	0	6	9
District3	10	6	0	5
District4	6	9	5	0

options:

a	X₁ 1
b	X₁ + X₂ 1
c	X₁ + X₂ + X₃ 1
d	X₁ + X₂ + X₄ 1
e	X₁ + X₂ + X₃ + X₄ 1

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