9-30C1 D
 Which of the following conditions would prevent communications between an Inmarsat-C data port and external data terminal equipment (DTE)?
A. Use of a stop bit in the DCE/DTE communication parameters.
B. Grounding pin 5 of the standard EIA-232 connector.
C. Use of a "0" parity bit in the DCE/DTE communication parameters.
D. Use of a "null" MODEM cable to connect the DTE device.
