What distinguishes structured data from unstructured data?

A$.$

Structured data includes repeating structures like relational databases, while unstructured data lacks such repeating structures.

B$.$

Structured data is often stored in XML and JSON documents, while unstructured data lacks any organizational properties.

C$.$

Structured data accounts for $80\%$ of all data in organizations, while unstructured data represents only $5-10\%.$

D$.$

Data analysis on structured data is generally more complex than on unstructured data.

E$.$

Structured data can be converted to unstructured data, while unstructured data cannot be converted to structured data.