What is the difference between a public IP address and a private IP address in terms of internet reachability and address allocation?

• A.Public IP addresses are globally unique, allocated by IANA/RIRs (ARIN, RIPE, APNIC, AFRINIC, LACNIC), and routable on the internet. Private IP addresses (RFC 1918: 10/8, 172.16/12, 192.168/16) are not routed on the internet, can be reused by any organization without registration, and require NAT to access the internet
• B.Public IPs are always static; private IPs are always dynamic. The type (static/dynamic) determines public vs. private classification
• C.Private IP addresses are more secure than public IPs because they are encrypted by the router before internet transmission
• D.Public IPs are provided by your ISP's DHCP server; private IPs are manually assigned by network administrators. There is no functional routing difference between them