10. What is the fog signals of a fishing vessel making way through the water but not engaged in fishing? (A) One prolonged blast followed by two short blasts at intervals of not more than 2 minutes. (B) One prolonged blast at intervals of not more than 2 minutes. (C) One prolonged blast followed by three short blasts at intervals of not more than 2 minutes. (D) One prolonged blast followed by four short blasts at intervals of not more than 2 minutes.