What is true about resource pools created on a Distributed Resource Scheduler (DRS) cluster?

A.
A root resource pool is created with the specified values.

B.
A root resource pool is automatically created using the aggregate total of the ESXi host resources in the cluster.

C.
A root resource pool is automatically created using the aggregate total of all resources in the datacenter.

D.
A root resource pool is not needed when creating resource pools on a DRS cluster.

Explanation:
A root resource pool is automatically created using the aggregate total of the ESXi host resources in the cluster.
https://www.vmware.com/pdf/vmware_drs_wp.pdf