The correct description of what the 9th and 10th Amendments do is:
They protect the states and the people by describing the limits of power of the central government.
The 9th Amendment asserts that the enumeration of certain rights in the Constitution does not mean that people do not have other rights that are not specifically listed. The 10th Amendment emphasizes that powers not delegated to the federal government are reserved for the states and the people, thereby limiting federal authority.