In which three ways is an IPv6 header simpler than an IPv4 header? (Choose three.)

A.
Unlike IPv4 headers, IPv6 headers have a fixed length.

B.
IPv6 uses an extension header instead of the IPv4 Fragmentation field.

C.
IPv6 headers eliminate the IPv4 Checksum field.

D.
IPv6 headers use the Fragment Offset field in place of the IPv4 Fragmentation field.

E.
IPv6 headers use a smaller Option field size than IPv4 headers.

F.
IPv6 headers use a 4-bit TTL field, and IPv4 headers use an 8-bit TTL field.