Which feature distinguishes the bulk compartment door from other cargo doors?

The bulk compartment door is indeed distinguished by its ability to be opened from both inside and outside the aircraft. This feature is particularly important for the bulk compartment as it allows for access when the aircraft is loaded and unloaded, enhancing operational efficiency. The dual access capability ensures that crew members can safely access the compartment without needing to move to a specific side of the aircraft or wait for ground service personnel, making it a practical design element for loading and unloading procedures.

The other options reflect characteristics that might be found in cargo doors but do not specifically set apart the bulk compartment door. Hydraulic mechanisms, electronic controls, and manual operations may vary across different aircraft and door designs, but the dual accessibility of the bulk compartment door is a unique aspect that directly supports its function in cargo operations.