c. The Tesla 6 is a new custom-designed sports car. An analysis of the task of building the tesla 6 reveals the following list of relevant activities, their immediate predecessors and their duration: JOB LETTER DESCRIPTION IMMEDIATE PREDECESSOR (S) NORMAL TIME (DAYS) A Start - 0 B Design A 8 C Order special accessories B 0.1 D Build frame B 1 E Build doors B 1 F Attach axles, wheels, gas tank D 1 G Build body shell B H Build tranmission and drivetrain B 2 3 I Fit doors to body shell G, E 1 J Build engine K Bench-test engine BI 4 J 2 ABC 3030 L Assemble chassis F. H. K 1 M Road-test chassis L 0.5 N Paint body I 2 O Install wiring N 1 P Install interior N 1.5 Q Accept delivery of special C 5 accessories R Mount body and accessories on M, O, P, Q 1 chassis S Road test car R 0.5 T Attach exterior trim S 1 U Finish T 0 (i) Draw a network diagram for the project. (3 marks) (ii) Mark the critical path and state its length. (2 marks) (iii) If the Tesla 6 had to be completed 2 days earlier, would it help to: a. Buy preassembled transmissions and drivetrains? b. Install robots to halve engine-building time? c. Speed delivery of special accessories by 3 days? (3 marks)