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Version a WCF service

Version 10 of the TestService (which implements the ITestService interface) is about to be updated and deployed. The ITestService interface adds two new methods, both of which are scoped with the public modifier and are decorated with the OperationContract attribute. Which of the following is true? (Choose all that apply)

The two additions will be considered breaking changes unless each assembly includes the correct version number.
As long as the service and contract pairs are both deployed with their respective version numbers (versions 10, 11), clients will not encounter any problems.
The two additions will not be breaking changes because they leave all previous functionality in place and just add new functionality.