Which statement best describes VM upgrades?

• A. Global changes to the main chain.
• B. Only cosmetic UI updates.
• C. New features, bug fixes, and performance or security improvements.
• D. Changes to the staking rewards model.

Answer: (C)

VM upgrades update the software that runs smart contracts in the network’s virtual machine. They introduce new features that expand what developers can build, fix bugs that could affect contract execution, and improve performance or security so contracts run more reliably and safely. These upgrades are about the runtime environment, not the base protocol rules, so they aren’t just cosmetic UI changes and don’t change staking rewards or other economic parameters. In short, VM upgrades are about evolving the execution environment to be more capable, efficient, and secure.