The data travels from the（）to the INMARSAT Network Coordination Station（NCS）and then down to the SES’s on ships at sea.

A.VHF
B.SART
C.NAVTEX
D.LES

A.forward error correction
B.aftward error correction
C.DGPS
D.error-free and low error reception

A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry