Which of the following teaching-learning resources in mathematics cannot be used for visually challenged students?

GeoGebra is a visual, computer-based dynamic geometry software that relies heavily on visual representation and cannot be effectively used by visually challenged students without significant adaptation. Taylor's abacus is a tactile arithmetic tool designed for the visually impaired. Tiles and GeoBoards provide tactile and physical interaction, making them accessible. Hence, GeoGebra is unsuitable for visually challenged learners.