A sailing vessel is overtaking a steam vessel in a fairway on International waters，so as to pass on the steam vessel’s port side． The sailing vessel is the（）.
A. privileged vessel and would sound two short blasts
B. burdened vessel and would sound two prolonged blasts followed by two short blasts
C. burdened vessel and would sound no whistle signal
D. privileged vessel and would sound no whistle signal
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