Bacteria can be genetically engineered to make human insulin. How is this possible? $(1$pt$)$

A$)$ The human insulin gene exists naturally in bacteria

B$)$ The human insulin gene is a mutated form of a bacterial gene for bacterial insulin

C$)$ Since the genetic code is nearly universal, the bacterium can produce human insulin

D$)$ The engineered insulin is slightly different due to differences in the genetic code

between eukaryotes and prokaryotes