Which of the following is/are true about the ellipse `x^2+4y^2-2x-16 y+13=0?` the latus rectum of the ellipse is 1. The distance between the foci of the ellipse is `4sqrt(3)dot` The sum of the focal distances of a point `P(x , y)` on the ellipse is 4. Line `y=3` meets the tangents drawn at the vertices of the ellipse at points `P` and `Q` . Then `P Q` subtends a right angle at any of its foci.