What are the fourth and fifth steps in developing a POS?

(A) Define the entities, attributes, relationships, connectivities, cardinalities, and constraints. Create the initial ERD segments
(B) Develop business rules. Create the initial ERD segments
(C) Develop business rules. Define the entities, attributes, relationships, connectivities, cardinalities, and constraints
(D) Define the major transaction modules. Create the initial ERD segments