f(a,b): return 0; 11)Consider a 2 by 3 integer array t a) How many rows does t have? b) How many elements does t have? c) Write the names of all the elements in the 3rd column of t 12) int a; Int *ptr: a-5; ptr-&a a)Show that&(ptr)-ptr b) What do you call ptr and what is equal to ? c)Show that "(&a)-a 13)What is the purpose of the following program ? #include-iostream> using namespace std; struct Rectangle f int width; int height; int mainof Rectangle r- t 20,55