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When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray $(O$-ray) and extra ordinary ray $(E$-ray) are produced. Then

• A
  Both $O$-ray and $E$-ray are polarised perpendicular to the plane of incidence
• B
  Both $O$-ray and $E$-ray are polarised in the plane of incidence
• C
  $E$-ray is polarised perpendicular to the plane of incidence and $O$-ray in the plane of incidence
• ✓
  $E$-ray is polarised in the plane of incidence and $O$-ray perpendicular to the plane of incidence