The correct answer to this question is option 2 - Trellis. A trellis drainage pattern is characterized by a main river that is joined by its tributaries at approximately right angles. This pattern typically occurs in areas with alternating bands of strong and weak rocks. The main river follows the path of the weaker rock layers, while the tributaries flow along the boundaries of the stronger rock bands. As a result, the tributaries join the main river at right angles. This type of drainage pattern is common in regions with folded or faulted geology, such as mountainous areas. The other options mentioned are different types of drainage patterns, with dendritic having a tree-like branching, rectangular having a grid-like pattern, and radial having tributaries that radiate outwards from a central point.