The client has requested your manager to provide high$-$level estimates for a new business case at the earliest possible. You would say that: $($Select all that apply$)$

Select one or more:a$.$ Close to real estimates can be provided now with function point methodologyb. Approximation can be done using a standard bottom up approachc. Close to real estimates can be provided using WBS methodology.d$.$ Approximation can be done using function point methodology