What distinguishes structured data from unstructured or semistructured data in analytics?

Question $2$ options:

a$)$

Structured data is exclusively numeric, whereas unstructured data is not.

b$)$

Unstructured data is more accurate and reliable than structured data.

c$)$

Structured and unstructured data are essentially the same and interchangeable in analytics.

d$)$

Only structured data can be transformed into a format suitable for analytics.

e$)$

Structured data is organized in a way that data mining algorithms can easily use, typically as categorical or numeric data.