Which three statements about the semantic versioning scheme are correct? $($Choose three.$)$

When you add a new functionality, but the implementation is still backward$-$compatible, you must increment MAJOR version.

When you make incompatible API changes, you must increment the MAJOR version.

When you make only code optimization without adding any new functionality, you do not need to change the version.

When you add a new functionality, but the implementation is still backward$-$compatible, you must increment the MINOR version.

When you make backward$-$compatible bug fixes, you must increment the PATCH version.