A 25 year old male presents to the dental clinic with black spots on his tooth. Intra-oral examination  reveals pit and fissure caries with 16. Which of the following ICDAS score will be given to this tooth based on the histological depth of the lesion?
Lesion depth in P/F was 50% inner enamel and 50% into the outer 1/3 dentin - score 2
Lesion depth in P/F with 77% in dentin - score 3
Lesion depth in P/F with 100% in dentin - score  5
Lesion depth in P/F was 100% reaching inner 1/3 dentin - score  6