Task: Class Definition Understanding (ontology: Earth_Environment/EnvironmentOntology)

Which of the following definitions best describes 'Bailey bridge'?

A. A bridge which is movable and has a vertical locating pin as its primary structural support, and a support ring about which it can pivot horizontally.
B. A bridge which is used for transportaiton, and which crosses over another road or railway.
C. A bridge which is a truss bridge, pre-fabricated, and portable.
D. A bridge which has its deck hung on vertical suspenders via suspension cables.

Answer: A bridge which is a truss bridge, pre-fabricated, and portable.