Answer:
Registrant – one who registers or is registered; a person who is formally registered and gains certain rights thereby.
Attendee – one who is present or attends a functions; a person who participates in a meeting
Participant – one that participates, shares or takes part in something; a participator; a partaker
Learner – one that gains knowledge, comprehension or mastery through experience or study; someone who learns or takes knowledge or beliefs; one that is learning; one that is acquiring new knowledge, behaviors, skills, values or preferences.
Explanation:
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