A company has a Microsoft Dynamics 2013 on-premises deployment. They want to start using the Microsoft Dynamics CRM Online 2016 features.
The company needs to determine the least costly method of migrating data from on-premises to online. It is determined that the client wants to move the account and contact information only one time while preserving the relationships between the two entities. Additionally, there are several custom fields in the contact records.
You need to migrate 5,000 account records and 14,000 contacts while maintaining the relationships between accounts and contacts. What is the most expedient method for migrating the accounts and contacts records?