Why would you set the capacity of a cluster member to zero in an OracleAS cluster (Web Cache)?

Why would you set the capacity of a cluster member to zero in an OracleAS cluster (Web Cache)?

A.
to allow the OracleAS Web Cache cluster to use the default capacity of the member

B.
to allow the OracleAS Web Cache cluster to change the capacity of the member dynamically

C.
to configure the member as the Web cache load balancer for the OracleAS Web Cache cluster

D.
to configure the member as an individual cache that does not request objects from its peer
cluster members

E.
to configure the member to be able to propagate only the invalidation requests to other cluster
members