Hindi is an Indo-Aryan language, while Telugu, Kannada, and Malayalam are Dravidian languages.

Dialectology is the study of linguistic variation within a language, including the geographical distribution of different dialects and the social factors that influence language use.

Telugu is a Dravidian language, while Kongu Tamil, Madurai Tamil, and Sri Lankan Tamil are dialects of Tamil.

Sociolinguistics is the study of the relationship between language and society, including the social factors that influence language use and the social meanings of language.

Occupation is not a social factor that can influence language use, as it is not a social category that is associated with distinct language patterns.

A dialect marker is a linguistic feature that is characteristic of a particular dialect, such as a particular pronunciation, grammatical construction, or vocabulary item.

Historical Linguistics is not a method used to study linguistic variation, as it is concerned with the historical development of languages rather than the synchronic variation within a language.

A register is a linguistic feature that is used in a particular social context, such as a particular style of speech or a particular set of vocabulary items.

Regional Dialect is not a type of sociolect, as it is a type of dialect that is defined by geographical boundaries rather than social factors.

Historical Linguistics is the study of the process by which a language changes over time, including the factors that drive language change and the methods used to reconstruct the history of a language.

Dialectology is not a method used to reconstruct the history of a language, as it is concerned with the synchronic variation within a language rather than the historical development of a language.

Anthropological Linguistics is the study of the relationship between language and culture, including the ways in which language reflects and shapes cultural values and beliefs.

Code-Switching is not a type of language contact, as it is a phenomenon that occurs when speakers of two or more languages use elements of both languages in the same conversation.

Creolization is the process by which a pidgin, which is a simplified language that develops when speakers of different languages need to communicate, becomes a full-fledged language with its own grammar and vocabulary.

Language Maintenance is not a type of language endangerment, as it refers to the efforts made by speakers of a language to maintain their language and prevent it from dying out.