$4\mathrm{.}3$ Construct a bar chart to use in managing the construction of a single$-$spanbridge. The identified activities are Drive piling west abutment $($WA$),2$ days Drive piling east abutment $($EA$),2$ days Construct WA cast in place pile cap, $3$ days Construct EA cast in place pile cap, $3$ daysEach pile cap requires $5$ days curing time before the precast girders can beplaced. Set girders, $1$ day Construction of cast$-$in$-$place concrete deck, $7$ days Cure deck, $14$ days West and east concrete approach slabs, $5$ days eachThere is only one crane available for pile driving and setting girders. Thecompany plans to use only one crew of carpenters and finishers for theconcrete work.a$.$ What is the project duration?b$.$ Are the two construct approach slab activities critical to the projectcompletion?$4\mathrm{.}4$ Construct a bar chart to use in managing the construction of a single$-$spanbridge as described in Question $4\mathrm{.}3.$ Again, there is only one craneavailable for pile driving and setting girders, but the company now plans touse two carpenter crews for the concrete work. The deck construction willtake only $5$ days using two crews. a$.$ What is the project duration? b$.$ If two cranes were available for pile driving, what would be theproject duration?