Suppose an IPv6 router wants to forward a v6 datagram to another IPv6 router, but they are connected via intervening IPv4 routers using tunneling. Then A. The sending IPv6 router creates one or more IPv6 fragments, which size is smaller than the maximum size of an IPv4 datagram. B. The sending IPv6 router creates an IPv4 datagram and puts it in the data field of an IPv6 datagram. C. The sending IPv6 router creates an IPv4 packet and puts the v6 datagram as data payload for the IPv4 packet.