Which of the following ranks is not a warrant officer rank?

The designation of Senior Chief Petty Officer does not belong to the category of warrant officer ranks because it is a non-commissioned officer rank within the United States Navy and Coast Guard. Warrant officers are a distinct class of officers who hold a commission, typically specializing in a specific technical field.

In contrast, both Warrant Officer and Chief Warrant Officer are recognized as official warrant officer ranks in various branches, reflecting their specialized roles and responsibilities. Therefore, when identifying ranks associated with warrant officers, Senior Chief Petty Officer stands out as an incorrect choice given its classification as non-commissioned rather than warrant officer status. The option indicating "None of the above" is also incorrect as it implies all listed options are warrant officer ranks, which is not the case.