Question #15: Which of the following functions are found when called in main during name lookup?

Question #15: Which of the following functions are found when called in main during name lookup? 55% on 10310 times asked #include <iostream> namespace standards { struct datastructure { }; void foo(const datastructure& ds) { } void bar() { } } int main(int argc, char** argv) { standards::datastructure ds; foo(ds); bar(); return 0; }
	foo - correct
	bar
	foo and bar
	neither
description: This is called koenig lookup or argument dependent name lookup. In this case, the namespace 'standards' is searched for a function 'foo' because its argument 'ds' is defined in that namespace. For function 'bar', no additional namespaces are searched and the name is not found. More details are in 3.4.2.