Based on communication strategy, the skill that is considered the cornerstone of effective communication is known as "Listening."
This is because effective listening forms the foundation of effective communication.
With effective listening, a recipient or responder would make the proper reply or response to the sender.
Without proper listening, arguments may arise in the communication process, or difficulty in understanding may occur among parties to a specific communication process.
Hence, in this case, it is concluded that the correct answer is "Listening."
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