What does the function f do? struct Point 2D double x; double y; struct Triangle Point2D v1; Point2D v2; Point2D v3; }; void f(Triangle& t) int temp = 12.5; temp = t.v1.x; t.v1.x = t.v1.y; t.v1.y = temp; int main () Triangle mytri; mytri.v1.x = 1.0; mytri.v1.y = 22.5; f(mytri); Swaps values of x and yin vertex 1 of an argument of type Triangle Initializes value of x in vertex 1 of an argument of type Triangle Sets all x,y values in all vertices of an argument of type Triangle Swaps value of x in vertex 1 with value of x in vertex 2, for an argument of type Triangle