By the mid$-1990$s$,\_\_\_\_\_\_\_\_\_\_$ was used as the standard to store and exchange structured and unstructured data.

a$.)$

Structured Query Language $($SQL$)$

b$.)$

Extensible Markup Language $($XML$)$

c$.)$

Unified Modeling Language $($UML$)$

d$.)$

Data Definition Language $($DDL$)$