Given the Following Code, What Namespace Does Display3 Belong To

Short Answer

Given the following code, what namespace does display3 belong to?
namespace ns1
{
void print);
void display1){};
}
namespace ns2
{
void print);
void display2){};
}
void display3);
int main)
{
using namespace ns1;
using namespace ns2;
display1);
display2);
return 0;
}
void display3)
{
}