Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting [KCET 2002]

• A.            The system can never be in equilibrium
• B.                    The system will be in equilibrium if the charges rotate about the centre of the triangle
• C.            The system will be in equilibrium if the charges have different magnitudes and different signs
• D.            The system will be in equilibrium if the charges have the same magnitudes but different signs