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Consider a database which contains people and their respective residence histories: Which of the following queries will return all the people that have never lived

Consider a database which contains people and their respective residence histories:
Which of the following queries will return all the people that have never lived in Boston? Select all that apply.
SELECT p.*
FROM people p
JOIN residence_history r ON p.person_id = r.person_id
WHERE r.city > 'Boston'
SELECT p.*
FROM people p
LEFT JOIN residence_history r ON p.person_id = r.person_id
WHERE r.city > 'Boston'
SELECT p.*
FROM people p
WHERE NOT EXISTS
(
SELECT *
FROM residence_history r
WHERE p.person_id = r.person_id AND city = 'Boston'
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