What is the purpose of the 'std unordered map' container in...

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What is the purpose of the 'std::unordered_map' container in C++ STL?

A. To store elements in key-value pairs with constant-time access

B. To store elements in a sorted sequence with constant-time access

C. To store elements in a stack with constant-time access

D. To store elements in a queue with constant-time access

Answer: Option A

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