having a friendly bet w/ my neighbor...need to know which is correct:

"how many times has your doorbell (rung or rang) this morning?"

I hope you bet on 'rung'.

Best wishes, Clive
Students: Are you brave enough to let our tutors analyse your pronunciation?
unless it was:
"how many times did your doorbell ring today?"
Either of these is correct:
The doorbell rang... or
The doorbell has rung...