Which dollar is strong?

Could you elaborate on the context of the question "Which dollar is strong?"? There are several currencies around the world that use the term "dollar" in their name, such as the United States Dollar (USD), the Canadian Dollar (CAD), the Australian Dollar (AUD), and the New Zealand Dollar (NZD). The strength of a currency is typically measured against other currencies, often through exchange rates. So, when someone asks "Which dollar is strong?", they are likely asking which of these dollar-denominated currencies is currently performing well or has a high value relative to other currencies. It's important to note that the strength of a currency can fluctuate based on various economic, political, and social factors.