Some students reported how many textbooks they have. The dot plot shows the data collected: A dot plot is titled Students Textbooks and labeled Number of Textbooks. The values on the horizontal line are 2, 3, 4, 5, and 6. There is 1 dot above 2, 2 dots above 3, 4 dots above 4, 5 dots above 5, and 4 dots above 6. What do the dots above the number 6 indicate? There are exactly 6 students with 4 textbooks. There are exactly 4 students with 6 textbooks. There are exactly 6 students with less than 4 textbooks. There are exactly 4 students with less than 6 textbooks.