1   1   1   1   1   1
     0   1   2   3   4   5   6   7   8   9   0   1   2   3   4   5
   +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
0: |                            OPTION-CODE                        |
   +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
2: |                           OPTION-LENGTH                       |
   +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
4: | INFO-CODE                                                     |
   +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
6: / EXTRA-TEXT ...                                                /
   +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+