Question 827 Deck General

The correct answer is B) a freight container in which the contents are enclosed by permanent structures. The term "closed freight containers and closed cargo units" refers to freight containers that have permanent, rigid structures surrounding the contents, such as metal or wooden walls. This definition aligns with option B, which describes a freight container with contents enclosed by permanent structures. The other options are incorrect because they do not accurately describe the key characteristic of closed freight containers - the presence of permanent, rigid enclosures. Option A mentions "rigid surrounding walls" but does not specify that they are permanent structures. Options C and D describe containers with non-permanent materials like fabric or plastic, which do not meet the definition of a closed freight container.