How are the selected values represented in Apex?

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In a single record, a user selects multiple values from a multi-select picklist.

How are the selected values represented in Apex?
A . As a List<String> with each value as an element in the list
B . As a String with each value separated by a comma
C . As a String with each value separated by a semicolon
D . As a Set<String> with each value as an element in the set

Answer: C