What is the output of the following code?stackType stack;int x, y;x = 4;y = 2;stack.push(6);stack.push(x);stack.push(x + 1);y = stack.top();stack.pop();stack.push(x + y);x = stack.top();stack.pop();cout << "x = " << x << endl;
A. x = 4
B. x = 5
C. x = 6
D. x = 9
Answer: D
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