The primary dentition in humans differs from permanent dentition in not having one of the following types of teeth:

1. Canine

2. Premolars

3. Molars

4. Incisors

Which one of the following correctly represents the normal adult human dental formula?

1. $\frac{3}{3},\frac{1}{1},\frac{3}{3},\frac{3}{3}$

2. $\frac{3}{3},\frac{1}{1},\frac{3}{2},\frac{1}{1}$

3. $\frac{2}{2},\frac{1}{1},\frac{3}{2},\frac{3}{3}$

4. $\frac{2}{2},\frac{1}{1},\frac{2}{2},\frac{3}{3}$