Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| class | leading bits | size of network number bit field | size of rest bit field | number of networks | addresses per network | start address | end address |
| class a | 0 | 8 | 24 | 128 (2 7 ) | 16777216 (2 24 ) | 0.0.0.0 | 127.255.255.255 |
| class b | 10 | 16 | 16 | 16384 (2 14 ) | 65536 (2 16 ) | 128.0.0.0 | 191.255.255.255 |
| class c | 110 | 24 | 8 | 2097152 (2 21 ) | 256 (2 8 ) | 192.0.0.0 | 223.255.255.255 |
| class d ( multicast ) | 1110 | not defined | not defined | not defined | not defined | 224.0.0.0 | 239.255.255.255 |
| class e (reserved) | 1111 | not defined | not defined | not defined | not defined | 240.0.0.0 | 255.255.255.255 |
Title:
classful network
Statement:
the sizes of class d and class e rest bit fields are not defined
Answer:
supported