Briefing Zend Knowledge

What can prevent PHP from being able to open a file on the hard drive (Choose 3)?

What can prevent PHP from being able to open a file on the hard drive (Choose 3)?

A.
File system permissions

B.
File is outside of open_basedir

C.
File is owned by another user and safe_mode is enabled.

D.
File is inside the /tmp directory.

E.
PHP is running as the web server user.