Using the following table: ID Activity Early Start Late Start Duration R1, No of R2, No of R1 and R2 (Days) People prople Rate=10/hr Required Required A Define 0 0 2 2 Requireme nts B Design 4 4 2 4 2 Application C Draft User 4 10 2 3 2 Manual D Prepare 6 6 4 6 2 Code E Test Code 10 10 2 4 2 F Correct 12 12 3 2 2 Code What is the cost of activity D? O $2720 O $2560 O $4260 O $1820