A controller issues the instruction: 'Speedbird 412, reduce speed to one eight zero knots, expect further reduction on final.' What are the two instructions contained in this message?
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A
Reduce to 180 knots now, and expect another speed reduction later
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B
Reduce to 180 knots only when on final approach
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C
Maintain 180 knots and request further clearance
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D
Reduce speed and contact approach on a new frequency