Final answer:
A crane operator must have loading charts, special hazard warnings, and the instructions & operator's manual available at all times for safe operation, making the correct answer 'd. All of the above'.
Step-by-step explanation:
The crane operator must have a few critical documents readily available for use at all times for the safe and efficient operation of the crane. These documents include the crane's loading charts, which provide essential information on the crane's capacity and operating limits based on various configurations and setups. Additionally, special hazard warnings inform the operator of potentially dangerous situations that may not be immediately apparent and require attention to avoid accidents. Moreover, having the instructions & operator's manual is crucial as it contains the detailed operation, maintenance, and safety information specific to the crane model being operated.
Therefore, the correct answer to the question of which of the following must be readily available to the crane operator for use at all times is d. All of the above.