_____ is a standardized language that all major relational database software uses.

A) Extensible Markup Language (XML)
B) Standardized Database Language (SDL)
C) Structured Query Language (SQL)
D) Query Design Language (QDL)

Structured Query Language (SQL) is a standardized language used by all major relational database software for managing and querying data. It provides a framework for organizing, retrieving, and manipulating data stored in a database. XML is a markup language used for storing and exchanging data, but it is not a language used specifically for database management. SDL and QDL are not widely recognized or used in the industry.