__________ Is a Type of 'Additive Manufacturing' Where a Medium

Multiple Choice

__________ is a type of 'additive manufacturing' where a medium, such as plastic, ceramic, or metal, is extruded through a computer-controlled tool head which lays down the medium in layers thus building up a real life product of three dimensions.

A) Paper prototyping by adding different material pieces
B) 3D printing
C) Plastic/ceramic/metal line manufacturing
D) Wood prototyping by adding different material pieces
E) Magic prototyping