Finding the Mode in Survey Data

A group of 20 students was surveyed about the number of books they read last month. The responses are as follows:

- 0 books: 3 students

- 1 book: 7 students

- 2 books: 5 students

- 3 books: 4 students

- 4 or more books: 1 student

What is the mode of the number of books read by the students?