What is the definition of azeotropic mixture?

• A. A liquid mixture of two or more substances that boils at a constant characteristic temperature lower or higher than anyof its components and that retains the same composition in the vapor state as in the liquid state.
• B. A liquid mixture of two or more substances that boils at a different characteristic temperature
• C. A liquid mixture of two or more substances that boils at a constant characteristic pressure
• D. A liquid mixture of two or more substances that boils at a constant characteristic temperature and pressure