Consider the following tree diagram: 
Which of the following nodes are leaf nodes?
Definitions:
Stepwise Regression
A method of regression analysis that involves automatic selection of independent variables to use in a model based on certain criteria.
Backward Elimination
A stepwise regression technique where all predictors are included in the model initially, and then the least significant predictor is removed step-by-step until the best model is identified.
Forward Selection
A stepwise approach in model selection where variables are added one by one based on their statistical significance.
Best-subsets Regression
A statistical method that involves analyzing all possible combinations of variables to identify the model that best fits the data.
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