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Which four Dravidian languages are recognized by the Constitution of India?

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Thematic map of South Asia showing the distribution of Dravidian languages, with different regions shaded or marked to indicate where specific Dravidian languages and subgroups are spoken. Most languages are concentrated in southern and central India, with some northern outliers in Pakistan, Afghanistan, and eastern India. A key identifies the languages by number and subgroup, and striped areas indicate regions where several subgroups overlap. — Dravidian languages Distribution of Dravidian languages.

The four Dravidian languages recognized by the Constitution of India as "scheduled languages" are:

Kannada
Malayalam
Tamil
Telugu

These languages are among the 22 scheduled languages listed in the Constitution, which allows them to be used by states for official correspondence and administrative purposes. Each of these languages also serves as an official state language in its respective region: Kannada in Karnataka, Malayalam in Keralam, Tamil in Tamil Nadu, and Telugu in Andhra Pradesh and Telangana.1234