Which Bantu languages borrowed click consonants from Khoisan languages?

Several Bantu languages have incorporated click consonants into their phonological systems through long-term linguistic and cultural contact with Khoisan languages.

The Bantu languages known to have borrowed these sounds include:

• Gciriku (Diriku) and Yei (Yeye), spoken in Botswana and Namibia, which have incorporated the four-click system found in many Khoisan languages.12
• Mbukushu, also spoken in Botswana and Namibia.2
• Zulu and Xhosa, which are Nguni languages of southern Africa that have integrated three click consonants into their respective languages.123
• Sotho, which has also been influenced by this contact.2

While these languages are considered full-fledged click languages, they are "derivatively so," as the clicks were acquired through external influence rather than being an original feature of the Bantu language family.1