257. Which of the following statements about an NMEA -0183 system is correct?

The cable shield must be grounded at both ends including the opto-isolators.
Opto-isolators must be used and the shield should be grounded to the talker chassis only.
Opto-isolators must be used and the shield should be grounded to the listener chassis only.
Version 2 devices use higher voltages than version 1 devices.

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