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:
Oligopoly
A market structure characterized by a few firms dominating the industry, leading to limited competition and often high prices for consumers.
Prisoner's Dilemma
A standard example of a game analyzed in game theory that shows why two completely rational individuals might not cooperate, even if it appears that it is in their best interest to do so.
Market Share
The share of a market that a certain company or product holds, frequently quantified as a proportion of the market's total sales.
Near-monopolies
Companies or entities that dominate a market to such an extent that they face little competition, often controlling prices and supply in the market.
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