In which two circumstances are private IPv4 addresses appropriate? (Choose two)

While internal hosts streaming to external resources can use private IPs with NAT, the phrasing 'solely to external resources' might imply scenarios where dedicated public IPs could be considered, though private IPs with NAT are functionally appropriate.

Private IPv4 addresses are ideal for hosts that communicate exclusively within the local network, as they do not require globally routable addresses for internal communication.

The public-facing interface of a firewall must use a public IPv4 address to be reachable from the internet, as private IP addresses are not routable on the public internet.

Private IPv4 addresses are appropriate for hosts that require minimal access to external resources because they can still reach the internet through a NAT device which translates their private addresses to public ones.

While private addresses combined with NAT allow bidirectional communication with external hosts, the private addresses themselves do not *allow* this; rather, NAT is the enabling technology for hosts with private IPs to communicate externally.