ANS:A - spigot and socket

The correct answer is: "spigot and socket" In stoneware pipes used for sewers, the common method of joining is through a spigot and socket joint. In this type of joint, one end of the pipe (spigot) fits into the socket of the adjacent pipe, creating a secure connection that prevents leakage. This joint provides both structural integrity and allows for some degree of movement to accommodate ground settlement or other factors without compromising the integrity of the sewer line.