What is this instruction on the left side of the screenshot asking me to do? Is is wanting a colgroup? How would that be defined? Can one row belong to multiple classes?

* : localhost/jpf_sudoku.html 1 N 1 The Japanese puzzle factory Case Problem 2: The Japanese Puzzle Factory Due on Apr 1 at 11:59 PM EDT heading cell displaying the letters A through 1. E /root/sandbox After the initial table heading cell in & jpf_logo.png the first, fourth, and seventh rows E jpf_navicon.png of the table body row group, insert @ jpf_reset.css three table data cells spanning jpf_styles.css three rows and three columns i jpf_sudoku.css each. Altogether, these nine data O jpf_sudoku.html cells will store the nine 3x3 boxes that are part of the Sudoku puzzle. 2 Sudoku 123456789 8 ipf_sudoku.css * jpf_sudoku.html * / 8 9 A B C D td> E F G /td> H I In the first row of the table body row, put the three table data cells you entered in the last step in the greenBox, goldBox, and greenBox classes, respectively. In the fourth row, the three data cells belong to the goldBox, greenBox, and goldBox classes. In the seventh row, the three data cells belong to the greenBox, goldBox, and greenBox classes. E IO 1 m DOO 8 8 8 To Play 8 6 8 3RF Sudoku is played on a 9x9 grid with a 3x3 boxes placed within the grid. Ent| digit from 1 to 9 in each table cell. A starting numbers have been supplied