What does the multiplicity at the actor end mean?

Choose the correct answer.

Given the following diagram fragment:

What does the multiplicity at the actor end mean?
A . At most two Initiator actor instances can perform the use case
B. Two Initiator actor instances are required to trigger the use case
C. Two Initiator actor instances are required to participate in the use case.
D. Multiplicities carry no meaning on use case diagrams

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Answer: C