A traceable requirements document .

provides testing and validation methods
is understandable by all interested parties
promotes using the latest coding standards
contains no inconsistent statements

is understandable by all interested parties

Explanation:

The traceable requirements document does not provide testing and validation methods. That is known as a test case, and are included in test reports, It also does not promote the latest coding standards. And it being available with no consistent statements is not the only requirement. The traceable requirement documents explain how the software prepared fits to all test cases to the user or the client, and all team members. And technicality is not required here. The only thing required is that it must be understandable by all the interested parties. And hence, the above option is correct.

they really not common the os x is just a better version of the os like in iphone theirs xr and their xs