Which of the following is a common type of tree support system?

Cabling is a common type of tree support system used to provide stability and support to tress that may be at risk of structural failure due to weak branches or an unbalanced canopy. This method involves installing cables or other supportive hardware between tree branches or trunk parts to reduce the risk of breakage during high winds or storms.

This technique is particularly useful for trees that have heavy branches that could fall or split due to excessive weight. By distributing the load and preventing movement, cabling helps to maintain the overall health and longevity of the tree while minimizing the likelihood of damage.

The other options listed, such as grafting, pruning, and fertilizing, serve different purposes. Grafting is a horticultural technique used to propagate plants or combine traits from different varieties. Pruning is the practice of selectively removing branches or stems to improve tree structure or health. Fertilizing provides nutrients to support growth but does not provide structural support. Each of these practices can contribute to the well-being of a tree, but none fulfill the specific role that cabling does in terms of physical support.