In your own words, in $2-5$ sentences, please explain how the currency system addresses the limitation of double coincidence of wants faced by the barter system $(15$ points$).$ I

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In your own words, in $2-5$ sentences, please describe why currency backed by physical commodities $($such as gold$)$ has inherent value, while fiat currency does not have inherent value $(15$ points$).$

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In your own words, in $2-5$ sentences, please explain why APIs are like sockets $(15$ points$).$

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In your own words, in $2-5$ sentences, please explain what is an IP address, why is it needed, and what is the biggest difference between IPv$4$ and IPv $6(15$ points$).$