JEE Main 2019 Mathematics question

Let ; r ≠ ±1. Then S represents:

• (A)an ellipse whose eccentricity is , where r > 1
• (B)a hyperbola whose eccentricity is , when 0 < r < 1
• (C)a hyperbola whose eccentricity is , when 0 < r < 1
• (D)an ellipse whose eccentricity is , when r > 1Correct