What Is One Major Goal That the OECD Guidelines, Convention

What is one major goal that the OECD Guidelines, Convention 108 and the Data Protection Directive (Directive 95/46/EC) all had in common but largely failed to achieve in Europe?

A) The establishment of a list of legitimate data processing criteria
B) The creation of legally binding data protection principles
C) The synchronization of approaches to data protection
D) The restriction of cross-border data flow