What standard hand signal is used to communicate "Use whip line"?

The standard hand signal used to communicate "Use whip line" is indeed indicated by the specific gesture that signifies the operator to engage the whip line. This signal is essential in rigging operations, especially when precise movements or adjustments are needed during lifting.

When the "Use whip line" signal is given, it helps ensure that communication is clear and that the operator can respond correctly to the rigger or signal person’s instructions. This is crucial for safety and efficiency on the job site, preventing accidents and ensuring that loads are maneuvered correctly.

The other choices do not specifically represent the action to use the whip line. Signals for raising the boom or hoisting typically relate to different aspects of crane operation rather than specifying which line or component to use for lifting. Thus, recognizing the proper hand signal for "Use whip line" directly correlates with the successful management of load control in rigging scenarios.