Which methods can be used to open a canopy?

The correct choice highlights the various methods utilized to open the canopy of the F/A-18 E/F aircraft, specifically focusing on the viable and practical techniques employed in normal and emergency situations.

Electricity refers to the electrical mechanisms that power the automatic canopy opening system, which is designed for ease of use and operational efficiency. Manually indicates that the canopy can also be opened using physical effort when circumstances prevent the use of the automatic system, such as in power failures or emergencies. Forcibly is included as a method that may need to be employed in extreme cases where the other methods are not functional, allowing personnel to access the cockpit if required, despite the risks involved.

This comprehensive approach to canopy operation ensures that flight crew members have various means to access the cockpit safely and effectively under a range of conditions. It is crucial for aircraft operation and safety protocols to include multiple options for canopy opening, especially in emergencies.