78. Why must all VHF Distress, Urgency and Safety communications (as well as VTS traffic calls) be performed in Simplex operating mode?

To minimize interference from vessels engaged in routine communications.
To ensure that vessels not directly participating in the communications can hear both sides of the radio exchange .
To enable an RCC or Coast station to only hear communications from the vessel actually in distress.
To allow an RCC or Coast station to determine which transmissions are from other vessels and which transmissions are from the vessel actually in distress.

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