Consider the following PHP string representing an SQL statement:
$query = "UPDATE users SET password='$password' WHERE username='$username'";

Which of the following values for $username or $password would change the behavior of this query when executed?

	[  ] None of the above
	[  ] $username = "foobar\' WHERE username='admin'";
	[  ] $password = "foobar' WHERE username='admin' --:";
	[  ] $username = "foobar\' WHERE username='admin'";
	[  ] $password = "\"foobar\" WHERE username=\"admin\"";