What is the appropriate term for the cannon's capability to adapt to different firing modes?

The term "Versatility" accurately reflects the cannon's capability to adapt to different firing modes. In the context of artillery, versatility implies the ability to perform various functions effectively and switch between those functions as required. This can involve adjusting the firing mode to suit different combat scenarios or types of ammunition.

While "Flexibility" and "Adaptability" might imply some degree of change, they do not encompass the full range of operational capabilities that the term "Versatility" conveys. Flexibility often refers to the ease of change or adjustment without the broader context of multiple operational roles. Similarly, adaptability may suggest responsiveness to specific situations but does not inherently communicate the diverse capabilities needed for different firing modes.

The term "Dual Capability" suggests only two specific functions, which limits the broader functionality that "Versatility" provides in relation to the cannon's firing modes. Thus, versatility is the most comprehensive and accurate term for describing a cannon's multifunctional operational capacity.