Explain why project management techniques such as PERT, CPM$,$Work Breakdown Structure, and time$-$cost trade$-$off analysis should be used to manage operations in a business with fluctuating demand.

B$.$Using the project management triangle$($time$,$cost$,$and quality$),$explain how these techniques can help balance competing objectives in a competitive environment. Provide an example of how you would apply "activity crashing" to reduce production time without significantly increasing costs or compromising quality.