Which recommendation will meet this viewing requirement?

A consultant is implementing a new Sales Cloud instance for Cloud Kicks that has a public sharing model for accounts. Different sales representatives own local accounts that create a multi-level Account hierarchy. Cloud Kicks needs to see the total number of closed won opportunities and the revenue value for all accounts in the hierarchy when viewing a parent account .

Which recommendation will meet this viewing requirement?
A . Configure Apex to update a custom field on the parent account with the total value of won opportunities from the child accounts
B . Create a workflow rule to update the custom field on the parent account displaying the total value of won opportunities from the child account
C . Create a Roll-up Summary field on the parent account displaying the total value of won opportunity from the child accounts
D . Configure a link on the account that will open a list view showing the total value of open opportunities for all accounts in the hierarchy

Answer: A