A. $_SESSION[‘foo’] = ‘bar’;
B. session_start();
C. session_set_save_handler (‘myopen’, ‘myclose’, ‘myread’,
‘mywrite’, ‘mydelete’, ‘mygarbage’);
D. $foo = $_SESSION[‘foo’];

Answer B is incorrect because session_start() only activates
PHP sessions for the current script. Answer C is incorrect because
session_set_save_handler() allows you to override PHP’s default session
mechanism with your own custom functions. Answer D is incorrect; session data is
being used as the value of a regular variable and is not being manipulated in any
way.