how can you identify errors and duplicates in a row definition structure before you update the existing structure?

In Microsoft Dynamics AX 2012, how can you identify errors and duplicates in a row definition
structure before you update the existing structure?

A.
In the General Ledger module, run the Audit trail report.

B.
Run the Where used report on the Row definitions form.

C.
In the System Administration module, run the Consistency check periodic function.

D.
In the Structure designer form, select the Check check box and the Simulate check box.