Improve security in PHP

In order to increase security, you have decided to put the PHP parser binary in /usr/local. Which of the following is/are some downsides of doing this?

A. PATH_INFO and PATH_TRANSLATED need to be configured

B. Any file containing PHP tags would need an additional first line

C. Any file containing PHP tags would need to be made executable

Options

1. A
2. A,B
3. B,C
4. A,B,C