_______ is used to remove the waste directly from the building.
(a) Branch sewer pipe
(b) Outfall sewer pipe
(c) Soil vent pipe
(d) Main sewer pipe
The question was asked in an interview for internship.
Enquiry is from Joints and Shapes of Sewers and Cleaning, Maintenance and Ventilation of Sewer in portion Construction of Sewers, Sewer Appurtenances and Sewage Pumping of Environmental Engineering