Which of the following statements about PHP arrays is false?

a. Sarr[="foo" is an example of adding an element to the end of an array.
b. Sarr = array("fon"=> 1, 1=> "foo"); is a valid array declaration.
c. foreach($arr as Skey) is an example of iterating through array values.
d. foreach($arr as $key) is an example of iterating through array keys.