What must all electrically operated cargo hooks have to prevent inadvertent operation?

To prevent inadvertent operation of electrically operated cargo hooks, it is essential that they incorporate an electrical activating device designed to ensure that the hook operates only when intended. This device typically requires a specific action, such as pressing a button or switch in a controlled manner, to engage the hook's operation. The presence of this control mechanism significantly reduces the risk of accidental activation, enhancing safety during rigging operations.

In contrast, options like a safety latch, while helpful for securing the load, do not directly address the issue of inadvertent activation. Similarly, an emergency switch may serve a purpose in quickly disabling a system but does not prevent the initial inadvertent operation. Additionally, having a manual override control could allow for the system's functionality to be bypassed but doesn't inherently prevent accidental activation of the hook itself. Each of these elements plays a role in safety but does not directly align with the primary requirement of preventing unintentional operation that the electrical activating device addresses.