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The correct answer is option 1 - Bharti-Airtel. Bharti-Airtel is an Indian telecommunication company that has recently acquired African mobile service operations in fifteen countries from Zairi. This means that Bharti-Airtel has purchased the African mobile service operations from Zairi and will now operate in those countries.
Option 2 - Tata Teleservices, is not the correct answer. Tata Teleservices is another Indian telecom company, but it is not the company that has acquired the African mobile service operations.
Option 3 - Reliance Communications, is also not the correct answer. Reliance Communications is another Indian telecom company, but it is also not the company that has acquired the African mobile service operations.
Option 4 - Bharat Sanchar Nigam Limited, is yet another Indian telecom company, but it is not the company that has acquired the African mobile service operations.
Therefore, the correct answer is option 1 - Bharti-Airtel, as it is the Indian company that has recently acquired the African mobile service operations in fifteen countries from Zairi.