John works as a Professional Penetration Tester. He has been assigned a project to test the Website security of www.we-a

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John works as a Professional Penetration Tester. He has been assigned a project to test the Website security of www.we-are-secure Inc. On the We-are-secure
Website login page, he enters='or''=' as a username and successfully logs on to the user page of the Web site. Now, John asks the we-are-secure Inc. to improve the login page PHP script. Which of the following suggestions can John give to improve the security of the we-are-secure Website login page from the SQL injection attack?

A. Use the session_regenerate_id() function
B. Use the escapeshellcmd() function
C. Use the mysql_real_escape_string() function for escaping input
D. Use the escapeshellarg() function