Which of the following describes the signal for moving tines horizontally?

The signal for moving tines horizontally is represented by the description of extending the arm, with the palm facing down and the forefinger pointing in the direction of the intended movement. This gesture clearly communicates to the operator which way the tines should move, providing a visual cue that is easily recognizable and understood in hoisting operations.

Using a palm-down position helps ensure that the signal is viewed from a distance and minimizes confusion, as the motion indicates a horizontal plane. The forefinger’s specific pointing direction is crucial, as it directs attention to the exact trajectory of the movement, ensuring that all team members have a common understanding of the actions being requested.

Other options would not effectively convey the idea of horizontal movement. For example, placing both fists in front of the body with thumbs pointing out lacks clarity about the direction of movement, while a vertical forearm with the forefinger pointing up suggests an upward motion rather than horizontal. Clasping hands in front of the body does not provide any directional signal at all, which could lead to miscommunication during operations.