What is the structure of a cylindrical body-and-arm assembly denoted by TLO?

• A. A vertical column with the arm fixed to the column, and end effector rotates independently.
• B. A horizontal arm that slides along a track.
• C. A vertical column with the arm moved up or down relative to the column, and the arm can be moved in or out relative to the column.
• D. A spherical joint arrangement with three rotational axes.

Answer: (C)

In a cylindrical configuration, the arm runs on a vertical column and has two key motions: it moves up and down along the column (vertical translation) and it can extend outward or retract inward from the column (radial translation). The base usually provides rotation around the vertical axis, enabling the arm to reach points around the column. The described structure matches this precisely: a vertical column, the arm moving up or down relative to that column, and the arm able to move in or out relative to the column. This combination—vertical motion plus radial extension anchored to a vertical column—is the defining feature of a cylindrical body-and-arm arrangement.

The other descriptions don’t fit for this configuration: a fixed arm with independent end-effector rotation doesn’t capture the in/out radial movement; a horizontal arm sliding along a track describes a linear/Cartesian setup; and a spherical joint with three rotational axes describes a different joint arrangement entirely.