Consider the following project management problem. How efficient is the AirRules smart phone assembly line described above?

Task Immediate Predecessor$($s$)$ Duration $($days$)$ A None $2$ B None $4$ C A $8$ D B $1$ E C$,$ D $6$ F D $2$

a$.$ Draw the Network diagram and include the Early Starts $($ES$),$ Early Finishes $($EF$),$ Late Starts $($LS$),$ and Late Finishes $($LF$)(10$ points$)$

b$.$ What is the expected completion time of this project? $(2$ points$)$

c$.$ What is the critical path through this project? $(2$ points$)$

d$.$ How much slack is in Activity C$?$ What does this mean? $(3$ points$)$

e$.$ How much slack is in Activity E$?(2$ points$)$