The Rover 6 is a new custom-designed sports car. An analysis of the task of building the Rover 6 reveals the following list of relevant activities, their immediate predecessors, and their duration:2 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 2 H Build transmission and drivetrain B 3 I Fit doors to body shell G,E 1 J Build engine B 4 K Bench-test engine J 2 L Assemble chassis F,H,K 1 M Road-test chassis L 0.5 N Pain body I 2 O Install wiring N 1 P Install interior N 1.5 Q Accept delivery of special accessories C 5 R Mount body and accessories M, O, P,Q 1 S Road test car R 0.5 T Attach exterior trim S 1 U Finish T 0 a) Draw a network diagram for the project. b) Mark the critical path and state its length. c) If the Rover 6 had to be completed 2 days earlier, would it help to: I. Buy preassembled transmissions and drivetrains? II. Install robots to halve engine-building time? III. Speed delivery of special accessories by 3days? d) How might resources be borrowed from activities on the noncritical path to speed activities on the critical path?