What should you pay attention to when connecting two widgets?

What should you pay attention to when connecting two widgets?
A . The output socket’s type does not have to be the same as the input socket’s type.
B. The input socket’s type should be the same as the output socket’s type.
C. The output socket’s type must be the same as the input socket type.
D. The input socket’s type must be a sub type of a composed item type.

Answer: C