Of the following list, which is the earliest milestone in language development?

Name: Of the following list, which is the earliest milestone in language development?
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Responding to commands such as "Show me your nose" typically occurs before the other milestones listed. It is a sign of understanding and following simple instructions, which usually happens before the development of a larger vocabulary, the ability to form two-word sentences, or the creation of original phrases.

Of the Following List, Which Is the Earliest Milestone in Language