Which statement best captures the rationale behind using a sample mean to infer the true value of a population mean? a. It is a safe and practical approach when the population parameter's value is already known. b. It is the most feasible method since surveying every individual in the population is typically impractical. c. It is preferred because it eliminates all forms of error in the estimation process. d. It is based on the certainty of knowing the population parameter's true value