The model below represents an equation.

2 long x tiles and 3 square 1 tiles = 3 long x tiles

Which represent like terms in the model of the equation?
2 long x tiles and 3 square 1 tiles
2 long x tiles and 3 long x tiles
3 long x tiles and 3 square 1 tiles
1 long x tile and 1 square 1 tile