Backward induction is the process used to value derivatives and bonds using a binomial tree. The process starts at each of the final nodes, and then works backwards through the tree, calculating the option value at each node. The value of the bond or derivative is determined by discounting the expected future cash flows at the risk-free rate. This method is particularly useful for American styled derivatives which can be exercised at any point during their life, as it allows for the possibility of early exercise.

Choice A is incorrect. Bootstrapping is a method used to calculate the zero-coupon yield curve from the prices of coupon-bearing bonds. It does not involve the use of a binomial interest rate tree for bond valuation.

Choice C is incorrect. Backtesting refers to testing a predictive model or trading strategy using existing historical data to see how accurately the model or strategy would have predicted actual outcomes. It does not involve valuing bonds using a binomial interest rate tree.