Which currency is known as ‘vehicle currency’?

A vehicle currency is a currency that is used widely in international trade and financial transactions by parties who do not reside in the country issuing that currency. The United States Dollar (USD) serves as the dominant global vehicle currency, facilitating the vast majority of cross-border invoicing, trade settlements, and foreign exchange transactions worldwide. Since the US Dollar is not among options A, B, or C, the correct answer is "None of the above".