The answer is 100% definitely A. You would need a team for that because one person could make a mistake. Other professionals in the room would be helpful to catch each other's error. This is a cardiac surgery were talking about. They need to error. Other ideas are helpful to. Just one idea could go wrong. Different thoughts and ideas are needed. The parents want their child alive after a surgery like this. Plus, a team is needed because not just one person does the surgery. All the doctors that work on the patient are needed to know what is going on, and be aware of all changes.
~Silver