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Cisco Certified Network Associate (CCNA) · Cisco
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C. They are used with NAT to preserve public IPv4 addresses. Explanation: RFC 1918 defines private IP address ranges that are not routable on the public Internet. These addresses are commonly used within internal networks. To enable devices using private IP addresses to communicate with the public Internet, Network Address Translation (NAT) is used. NAT converts private IP addresses to public IP addresses when sending traffic to the Internet, thereby preserving the limited pool of public IPv4 addresses.
Since RFC itself said it, I would go with C.
Actually RFC 1918 goes with NAT