What is the alternate spacing for the CTRs?

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You are designing a multi-story dwelling and need to place the CTR’s. Every floor is not available.

What is the alternate spacing for the CTRs?
A . Every 2 floors
B . Every 3 floors
C . Every 4 floors
D . Every 5 floors
E . 1st floor and midway up through the height of the building

Answer: B