During systems design:

Select one:

a$.$ database and file definitions are prepared.

b$.$ a conceptual data model $($E$-$R with attributes$)$ is prepared.

c$.$ an enterprise$-$wide data model is prepared.

d$.$ a conceptual data model $($E$-$R with only entities for the specific project$)$ is prepared.

e$.$ a logical model $($relational$)$ is prepared.