The Statement __________ Creates an Object of Type Stack as Defined

Multiple Choice

The statement __________ creates an object of type stack as defined in the optimize namespace.
Class stack { ... }; // Defined in the global namespace
Namespace optimize {
Class stack { ... }; // Defined in the optimize namespace
}

A) stack aStack;
B) std::stack aStack;
C) optimize aStack;
D) optimize::stack aStack;