How does the nested service define the error code thrown?

An error intermediate event has been attached to a nested service to catch specific errors.

How does the nested service define the error code thrown?
A . It is defined in an error end event.
B . It is mapped to a variable in the nested service.
C . It is assigned programmatically to tw.error.code.
D . It is assigned programmatically to tw. nestedservice.error.code.

Answer: D