The height of a tree can be obtained by recursively computing the heights of its subtrees, while keeping track of the height of the deepest subtree.Given the Node class (partially shown below) , select an expression to complete the recursive method height, which is designed to return the height of the tree rooted at a node. 
Definitions:
Isotonic Training
Physical training that involves movements or exercises where the muscle length changes against a constant load or resistance, commonly used to build muscle strength and endurance.
Muscle Strength
The ability of a muscle or group of muscles to exert force against resistance, essential for physical fitness and performing daily activities.
Maximal Force
The highest amount of force that a muscle or group of muscles can generate during a single maximal contraction.
Optimal Force
The best or most efficient level of force that can be produced by a muscle or group of muscles during a specific movement.
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