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Bootstrapping a yield curve refers to the process of constructing a zero-coupon yield curve from the prices of a set of coupon-bearing bonds. This technique involves using available financial instruments, primarily focusing on zero-coupon bonds as the foundational instruments for measuring spot rates. The correct response highlights that the bootstrap method relies on recursively estimating spot rates using various instruments, which could include both zero-coupon bonds and other types of bonds.

The bootstrap process begins with determining the pricing of short-term instruments to derive the first spot rate. Each subsequent spot rate is calculated by using the previously computed rates and adjusting for the coupon payments of the new instruments introduced in the sequence. This iterative approach allows for the construction of a full yield curve that reflects the current market's expected future interest rates.

Understanding the bootstrap method is crucial for financial analysis, as it helps investors and analysts in pricing derivatives, valuing fixed income securities, and managing interest rate risk. This methodology provides a detailed view of the relationship between time and yield, enabling better insights into investment decisions.