Which of the Following Best Explains 'Residential Engineering

Multiple Choice

Which of the following best explains 'Residential engineering'? 

A)  A situation where engineers from the supplier are co-located at the buyer's organization to work on design or manufacturing problems. 
B)  A situation where engineers from the supplier live on the premises of the buyer organization. 
C)  A situation where engineers from a consultancy are co-located at the buyer's organization to work on design or manufacturing problems. 
D)  A situation where accountants from the supplier are co-located at the buyer's organization to work on pricing problems.