Which linguist is credited with developing the concepts of Langue and Parole?

Explanation

The terms Langue and Parole were introduced by Ferdinand de Saussure, who distinguished between the abstract system of language (Langue) and its practical use in speech (Parole). Other linguists like Charles Sanders Peirce, Noam Chomsky, and Edward Sapir contributed to linguistics in different ways but did not coin these specific concepts.