Which of the following is the correct code for invoking a function without this

Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect?

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1) A function with no return value is called

2) Consider the following code snippet :

var tensquared = (function(x)
 {
return x*x;
}
(10));

3) What is the purpose of a return statement in a function?

4) Consider the following code snippet :

function constfuncs()
  {
     var funcs = [];
     for(var i = 0; i < 10; i++)
         funcs[i] = function()
 {
 return i;
 };
     return funcs; }
 var funcs = constfuncs();
 funcs[5]()

5) Consider the following code snippet

function printprops(o)
  {
     for(var p in o)
       console.log(p + ": " + o[p] + "\n");
 }