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Question #124 Difficulty: 3

According to the C++17 standard, what is the output of this program? 

    #include <iostream>

using namespace std;

struct A {};
struct B {};

template<typename T = A>
struct X;

template<>
struct X<A> {
   static void f() { cout << 1; }
};

template<>
struct X<B> {
   static void f() { cout << 2; }
};

template< template<typename T = B> class C>
void g() {
   C<>::f();
}

int main() {
   g<X>();
}

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