The sex ratio for the 0 – 6 years age group is known as _____________.

Both 2 and 3

The correct answer is Option 3: Both 2 and 3

NCERT : "Age specific sex  ratios began to be computed in 1961. The sex ratio for the 0 – 6 years age group (known as the juvenile or child sex ratio) has generally been substantially higher than the overall sex ratio for all age groups, but it has been falling very sharply. In fact the decade 1991–2001 represents an anomaly in that the overall sex ratio has posted its highest ever increase of 6 points from the all time low of 927 to 933, but the child sex ratio has dropped from 945 to 927, a plunge of 18 points taking it below the overall sex ratio for the first time. In 2011 Census (provisional) the child sex ratio again decreased by 13 points and now it is 919."