The cacoa bean used to make ruby chocolate is difficult to procure. After extensive research, the procurement team has identified the only vendors who supply the correct bean. Oliver must evaluate the quality of cocoa beans provided by these vendors. Also, he has to determine if the ruby chocolate should be produced using manual tools or automated tools and whether these tools need to be purchased or rented from a vendor. Which of the following techniques is Oliver using for estimation? A) Bottom-up estimating B) Alternatives analysis C) Parametric analysis D) Analogous estimating