If neither a sitting president nor vice president is seeking their party's nomination, the nomination is said to be

Open nomination

An open nomination is one whereby neither the sitting president or vice president is seeking nomination to be a party’s presidential candidate. An example of such a situation was in 2008 and in 1952 whereby neither the sitting president were seeking the nomination

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.