question: As shown in the figure, CD is a plane mirror, the light is emitted from point A, reflected by point E on CD, and irradiated to point B. If the incident angle is α, AC perpendicular  CD, BD perpendicular  CD, the feet of perpendicular are C, D, and AC = 3.0, BD = 6.0, CD = 10.0, then the length of the line segment ED is ()
  Choices:
  A:\frac{20}{3}
  B:\frac{10}{3}
  C:7
  D:\frac{14}{3}
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: As shown in the figure, CD is a plane mirror, the light is emitted from point A, reflected by point E on CD, and irradiated to point B. If the incident angle is α, AC perpendicular  CD, BD perpendicular  CD, the feet of perpendicular are C, D, and AC = 3.0, BD = 6.0, CD = 10.0, then the length of the line segment ED is ()
  Choices:
  A:\frac{20}{3}
  B:\frac{10}{3}
  C:7
  D:\frac{14}{3}
query_cot: Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: As shown in the figure, CD is a plane mirror, the light is emitted from point A, reflected by point E on CD, and irradiated to point B. If the incident angle is α, AC perpendicular  CD, BD perpendicular  CD, the feet of perpendicular are C, D, and AC = 3.0, BD = 6.0, CD = 10.0, then the length of the line segment ED is ()
  Choices:
  A:\frac{20}{3}
  B:\frac{10}{3}
  C:7
  D:\frac{14}{3}
question_for_eval: As shown in the figure, CD is a plane mirror, the light is emitted from point A, reflected by point E on CD, and irradiated to point B. If the incident angle is α, AC perpendicular  CD, BD perpendicular  CD, the feet of perpendicular are C, D, and AC = 3.0, BD = 6.0, CD = 10.0, then the length of the line segment ED is ()
  Choices:
  A:\frac{20}{3}
  B:\frac{10}{3}
  C:7
  D:\frac{14}{3}