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Given the following function template, select all valid calls to it.
template <class T>
T sum (T a, T b)
{
}
T result;
return a + b;
Code source: Overloads and templates E
std::string sum1 = sum<std::string>(10, 20);
int sum1 = sum(10, 20);
std::string sum1 = sum<std::string>("10", "20");
float sum1 = sum<float>(10.0, 20.0);
int sum1 = sum<int>(10, 20);

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