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Brent Moore is a project manager for a toy company. He is estimating the quantity of plastic required for completing the new product line. As part of the estimation process, he undertakes the following tasks:

A$.$ He takes into consideration the location and availability of plastic when estimating the type and quantity of plastic required.

He refers to the project charter for the cost of plastic that may impact its selection from the quantity perspective.

He estimates the quantity of plastic required at the activity level and then aggregates it to determine the estimates for work packages and at the summary project levels.

D$.$ He estimates the plastic required for the upcoming project using expert judgment based on the information of a previous similar project.

Which of these tasks are relevant to activity resource estimation?

A$)$ Task D only

B$)$ Task A only

C$)$ Tasks B and D

D$)$ Tasks A and C