A user in a multilingual online project forum notices a misunderstanding escalating between two members due to a poorly translated idiom. The user intervenes by rephrasing the original point in simpler, neutral language and asking both parties for clarification. According to the CEFR's descriptors for Online Interaction Competence, this user is primarily demonstrating which skill?
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A
Expressing personal opinions using emojis.
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B
Goal-oriented online collaboration.
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C
Mediating in an online exchange.
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D
Applying advanced sociolinguistic norms.