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Which option best reflects Rule 38 — Exemptions?
A
Gong is never sounded alone: it always *follows* the bell, on vessels ≥ 100 m.
B
The vessel being overtaken answers with one prolonged, one short, one prolonged and one short if she agrees.
C
A power driven vessel making way through the water sounds one prolonged blast at intervals of not more than 2 minutes.
D
Exemptions are limited to specific requirements and time periods.