What does a tag line do during a lift?

A tag line is a crucial safety tool during a lift, designed primarily to control the load’s movement and positioning. It is typically a rope or line attached to the load that allows the personnel on the ground to manipulate and guide the load as it is being lifted. This is particularly important in ensuring that the load does not swing uncontrollably or rotate unexpectedly, which could pose hazards to both the workers and the equipment involved in the lifting operation. By using a tag line, workers can provide real-time adjustments, helping to maintain precise control over how the load is orientated and moved into place.

The other choices discuss functions that are not performed by a tag line. For example, measuring the weight of the load is the role of load cells or scales, and improving the hook's stability generally pertains to rigging hardware rather than the tag line itself. While keeping the operator informed is important, this function is usually fulfilled through communication systems rather than using a tag line. Therefore, option A accurately reflects the primary purpose of a tag line in a lifting scenario.