Step 1: Understanding the Concept:
This question tests definitions related to Floating (Flexible) and Fixed exchange rate systems and the terminology of currency value changes.
Step 2: Detailed Explanation:
1. Statement (A): True. Floating exchange rates are "market-determined" based on forex demand and supply.
2. Statement (B): True. In a fixed system, when the government intentionally lowers the value of its currency, it is technically termed Devaluation.
3. Statement (C): True. If the exchange rate increases (e.g., from \$1 = 70 INR to \$1 = 80 INR), it means the Rupee has become cheaper and the Dollar more expensive. This is Depreciation of the domestic currency.
4. Statement (D): True. This refers to the theory of Purchasing Power Parity (PPP), which states that exchange rates move to equalize the price of a basket of goods across countries.
Step 3: Final Answer:
All provided statements (A, B, C, and D) are correct according to macroeconomic principles.