What is the difference between std::condition_variable and std::condition_variable_any in C++ multi-threading?
A. std::condition_variable is more efficient than std::condition_variable_any
B. std::condition_variable_any can work with any mutex type, while std::condition_variable can only work with std::mutex
C. std::condition_variable can only work with std::mutex, while std::condition_variable_any can work with any mutex type
D. std::condition_variable_any is more efficient than std::condition_variable
Answer: Option C

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