Which of the following code snippets writes the content of the “source.

file_put_contents("target.txt", fopen("source.txt", "r"));

file_put_contents("target.txt", readfile("source.txt"));

file_put_contents("target.txt", join(file("source.txt"), ""));

file_put_contents("target.txt", file_get_contents("source.txt"));

$handle = fopen("target.txt", "w+"); fwrite($handle,

file_get_contents("source.txt")); fclose($handle);