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Which answer is consistent with Rule 32 — Definitions (Sound Signals)?
A
Same number of blasts means different things depending on duration — duration is part of the signal.
B
≥ 100 m: gong added (in addition to whistle and bell).
C
Gong is never sounded alone: it always *follows* the bell, on vessels ≥ 100 m.
D
The vessel being overtaken answers with one prolonged, one short, one prolonged and one short if she agrees.