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Which answer is consistent with Rule 7 — Risk of Collision?
A
"Whistle" is a generic term for any Annex III-compliant horn, siren or foghorn.
B
The term "prolonged blast" means a blast of from four to six seconds' duration.
C
Radar must be used systematically, not casually.
D
Manual sounding must always remain possible even if the device is electronic.