((a)) ** .—** Neither the Secretary nor the Board has jurisdiction under this part over the transportation of property by motor vehicle when—

((1)) the property is transported by a person engaged in a business other than transportation; and

((2)) the transportation is within the scope of, and furthers a primary business (other than transportation) of the person.

((b))

((1)) ** .—** Neither the Secretary nor the Board has jurisdiction under this part over transportation of property by motor vehicle for compensation provided by a person who is a member of a corporate family for other members of such corporate family.

((2)) ** .—** In this section, “corporate family” means a group of corporations consisting of a parent corporation and all subsidiaries in which the parent corporation owns directly or indirectly a 100 percent interest.