Which statement correctly compares IPv4 and IPv6 headers in terms of address length and header structure?

Which statement correctly compares IPv4 and IPv6 headers in terms of address length and header structure?

• A. IPv4 headers typically 20 bytes minimum with 32-bit addresses; IPv6 headers are fixed at 40 bytes with 128-bit addresses; IPv6 uses extension headers to carry options.
• B. IPv4 uses 128-bit addresses and a 40-byte header.
• C. IPv6 headers are variable length and do not have extension headers.
• D. IPv4 headers are 60 bytes minimum and use 64-bit addresses.

Answer: (A)