Which two circumstances are private IPv4 addresses appropriate?

In which two circumstances are private IPv4 addresses appropriate? (Choose two.)
A. on internal hosts that stream data solely to external resources
B. on hosts that communicates only with other internal hosts
C. on the public-facing interface of a firewall
D. on hosts that require minimal access to external resources
E. to allow hosts inside an enterprise to communicate in both directions with hosts outside the enterprise

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