What is the difference between std mutex and std recursive mutex...

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What is the difference between std::mutex and std::recursive_mutex in C++ multi-threading?

A. std::mutex can be locked multiple times by the same thread, while std::recursive_mutex cannot

B. std::recursive_mutex can be locked multiple times by the same thread, while std::mutex cannot

C. std::mutex cannot be locked multiple times by the same thread, while std::recursive_mutex can

D. They both provide the same functionality

Answer: Option B

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