Identify the Common Factors 4yz+4

Find the list of all common factors for ${\displaystyle 4yz+4}$ by finding the greatest common factor (GCF) for ${\displaystyle 4yz+4}$ and breaking it down to the list of common factors ${\displaystyle 1,4,2,2,4}$. Then find all the possible combinations of these common factors, which are also common factors.