CONCEPT: Eccentricity: The constant ratio of distance of point lying on conic from the focus to its perpendicular distance from directrix is called the eccentricity of a conic section and is denoted by e. - For an ellipse: e<1 - For a parabola: e=1 - For a hyperbola: e>1 - For a circle: e=0 - For a pair of straight lines: e=∞ CALCULATION: As we know that, eccentricity of a circle is 0 i.e e=0 for a circle. So, statement 1 is correct. We also know that, eccentricity of a parabola is equal to 1 i.e e =1 for a parabola. So, statement 2 is also correct. We also know that, eccentricity of an ellipse is always less than 1 i.e e<1 for an ellipse. So, statement 3 is also correct. Hence, correct option is 4.