Hands-only CPR is better than:
a. no CPR
While conventional CPR (which includes rescue breaths) can be effective in certain situations, hands-only CPR is recommended for untrained bystanders and may be easier to perform in an emergency. It significantly increases the chances of survival compared to doing nothing at all. An automated external defibrillator (AED) is also a valuable tool but is not a replacement for CPR; rather, it should be used in conjunction with CPR when available.