When the project occupancy is not known, which method is recommended?

When the project occupancy is not known, which method is recommended?
A . Default occupant density from ASHRAE 62.1-2010, Table 6-1
B . Default occupant density from ASHRAE 90.1-2010, Table G3.1.1A
C . Weekly average taken into account all the occupants in a typical 24-hour day of operation
D . Occupancy measured for eight hours, between 8 a.m. and 5 p.m., for all occupancy patterns

Answer: A

Explanation:

This method is recommended when the project occupancy is not known, because it provides the default occupant density values for various space types, such as offices, classrooms, retail, and restaurants1. These values are based on the typical or average occupancy of similar spaces, and can be used to estimate the ventilation requirements and energy performance of the project2.

References: = LEED v4: Building Design + Construction Guide, ASHRAE 62.1-2010, Table 6-1.