John is putting together his budget for the project and as part of this process, he is actively discussing and soliciting estimates from each member of the project team for the overall budget. He presents his budget to senior management and Susan rejects it$,$ stating, $$Team members are always going to pad their estimates. I will give you the figure I want you to shoot for.$$ Susan is employing what method for project cost budgeting?

Parametric

Comparative

Top$-$down

Bottom$-$up