Federal agencies such as the nsa, fbi, and cia use specialty classification schemes. for materials that are not considered "national security information," data is the lowest-level classification.

Unclassified

Explanation:

In the schemes used by federal agencies like FBI, CIA and NSA, these agencies make use of special classification of data into 3 groups which are Confidential, top secret and secret data.

The information without any label or for those materials that are under consideration "National Security Information," data is grouped as unclassified which is the lowest of all the level of data classification.

The unclassified data is the default data and it is that information that is allowed to flow without the need of clearance to the people. This information, sometimes, when restricted to flow or release is referred to as Sensitive But Unclassified data  or is used officially only.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

answer; the edward snowden leaks of nsa classified material;