Which entrances need non-smoking signage and at what maximum distance from the door(s) can the non-smoking signage be posted?

The LEED project has a main entrance and two service entrances in an alley behind the building.

Which entrances need non-smoking signage and at what maximum distance from the door(s) can the non-smoking signage be posted?
A . At the main entrance, 10 ft. (3 m) from the door
B . At the main entrance, 25 ft. (7.5 m) from the door
C . At the main entrance and the two service entrances, 10 ft. (3 m) from the doors
D . At the main entrance and the two service entrances, 25 ft. (7.5 m) from the doors

Answer: C

Explanation:

According to the LEED v4 Reference Guide for Building Design and Construction, no smoking signage must be placed within 10 feet (3 meters) of every building entrance, except for alarmed emergency exits. This applies to both the main entrance and the service entrances, regardless of their location or frequency of use. The signage is intended to communicate the no-smoking policy to occupants and visitors and prevent environmental tobacco smoke from entering the building.

Reference: EQ Prerequisite Environmental Tobacco Smoke Control, LEED v4 Reference Guide for Building Design and Construction123