You have a meeting with a colleague from a different department scheduled for 10:00am. You've spoken to the receptionist and you have been waiting outside the colleague's office for a while and it is now 10:05. You want to make sure the person knows you're there. You will
选项：

A:peek your head in the doorway and say "Excuse me".
B:stand near the door where your colleague will see you.
C:continue to sit and wait.
D:enter the office confidently, introduce yourself and remind them you have a 10:00am meeting.