Which two statements are true about recursive nameservers that are supported by Oracle Linux?

Which two statements are true about recursive nameservers that are supported by Oracle Linux?

A.
They may be authoritative.

B.
They may forward requests to authoritative name servers on some occasions.

C.
They may be primary nameservers.

D.
They cache replies from previous name resolution requests.

E.
They may be secondary nameservers.