What is the Expected Output int main() { vector arr[2]; arr[0].push_back(10); arr[1].push_back(20); arr[1].push_back(30); cout << arr[1].at(1) << endl; return 0; }

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What is the Expected Output

int main() {

vector<int> arr[2];

arr[0].push_back(10);

arr[1].push_back(20);

arr[1].push_back(30);

cout << arr[1].at(1) << endl;

return 0;

}

a. 20

d. 10

c. 30

b. run time error

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