Carl is writing cgi-bin scripts in PERL for some web pages. He is concerned about malicious
users trying to exploit the site and/or the cgi-sripts. If Carl uses the following code, what will he be
able to prevent?
$filename =~ s/[^A-Za-z0-9_-.//g

A.
Dangerous input expression

B.
Algorihmic complexity attacks

C.
XSS attack

D.
Insecure environmental variables

Explanation: