Which languages belong to the South Slavic branch?

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Map of Europe showing the geographic distribution of Slavic languages, color-coded by language group: East Slavic (Russian, Ukrainian, Belarusian), West Slavic (Polish, Kashubian, Czech, Slovak, Sorbian), and South Slavic (Bosnian-Croatian-Montenegrin-Serbian, Slovene, Bulgarian, Macedonian). Striped areas indicate regions where bilingualism is common. — Slavic languages Distribution of the Slavic languages in Europe.

The South Slavic branch is categorized into two primary subgroups consisting of the following languages:

Bosnian-Croatian-Montenegrin-Serbian and Slovene: This subgroup includes Slovene as well as the languages often grouped together as Bosnian-Croatian-Montenegrin-Serbian.12
Bulgarian-Macedonian: This subgroup comprises Bulgarian and Macedonian.2

While these languages are traditionally classified under the South Slavic branch, it is important to note that linguistic frontiers in the Slavic family are often connected by transitional dialects, and the traditional "family tree" model is a simplification of a complex historical process of dialectal differentiation and reintegration.2