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According to Rule 36 — Signals to Attract Attention, which statement is correct?
A
The term "prolonged blast" means a blast of from four to six seconds' duration.
B
If necessary to attract attention, a vessel may make light or sound signals that cannot be mistaken for any prescribed signal.
C
Manual sounding must always remain possible even if the device is electronic.
D
Bell and gong may be replaced by equivalent equipment, but manual sounding must always remain possible.