Which of the following is classified as a Residential Group R-3 occupancy?

Residential Group R-3 occupancy is defined by the International Building Code (IBC) and refers to low-density residential uses. This category includes buildings that are intended for sleeping purposes and inhabit not more than two dwelling units or other similar facilities.

The classification encompasses various types of residential scenarios as described in the options. It includes buildings that do not contain more than two dwelling units, which corresponds to standard family homes or duplexes. Boarding houses with 10 or fewer occupants are also classified under this category, as these establishments cater to transient individuals but still fall within the residential scope. Similarly, lodging houses with 5 or fewer guest rooms fit the R-3 classification, as they provide accommodation but do not exceed the occupancy limits defined.

Since all the provided statements accurately describe examples of Residential Group R-3 occupancies, the correct response is inclusive of all these elements. This comprehensive approach reflects the diversity within the R-3 classification while adhering to safety and regulatory provisions set by building codes.