The umbilical cord will stop pulsating approximately 3-5 minutes after birth.
Actually to be normal blood pressure the systolic must be near to 120 while diastolic must be near to 80.... so in this case 124/84 is near to normal so Debbie have normal blood pressure
If you're meaning like to check if someone's respiratory system is working right you'd want to find a pulse. If you find there's no pulse you should start chest compressions and call 911 continuing to do chest compressions
Could be all of these but if I had to choose one, I would go with. Behavioral signs. Hope this helps.