Which of the following is the correct way to perform CPR on an unresponsive man with no signs of life?

A) Begin by checking for a pulse and if absent, proceed with chest compressions and rescue breaths.
B) Start with rescue breaths to provide oxygen, followed by chest compressions to circulate blood.
C) Administer an AED (Automated External Defibrillator) shock immediately, followed by chest compressions.
D) Call emergency services and wait for professional help to arrive without performing any CPR.