How do you embed a subscreen in a main screen? Please choose the correct answer.

How do you embed a subscreen in a main screen? Please choose the correct answer.
A . Use SET SUBSCREEN in the flow logic of the main screen.
B . Use SET SUBSCREEN in a PBO module of the main screen.
C . Use CALL SUBSCREEN in the flow logic of the main screen.
D . Use CALL SUBSCREEN in a PBO module of the main screen

Answer: C