GMDSS: Element 7

1. A Consisting of 7 bits, with four ones and three zeros.
2. B Consisting of 7 bits, with four zeros and three ones.
3. C Consisting of 5 bits TELEX and 8 bits Fax.
4. D Consisting of 5 bits for ship stations and 7 bits for shore stations.

Tip: press A-D to answer