What aspect of Advanced Load addresses legacy data?

The aspect of Advanced Load that addresses legacy data primarily involves the process of loading important legacy data into the system. This is crucial during implementation as organizations often have significant historical data that needs to be retained for various reasons, including compliance, reporting, and continuity of operations. Legacy data might include employee records, payroll information, historical transactions, and other relevant information that impacts the current state of the organization. Advanced Load provides functionalities and methodologies to ensure that this historical data can be accurately and efficiently integrated into the new system so that it is usable alongside new data.

The other choices focus on different processes that are important in data loading but do not specifically address the handling of legacy data. Importing recent data is primarily concerned with current transactions or information, while fixing errors during setup deals with ensuring the setup process is error-free. Creating new data structures involves designing configurations for new data within the system, which does not directly involve legacy data. Thus, the primary focus on loading important legacy data makes this the correct answer.