What's is DBI and DBD?

What does Perl -e on the command line do?

Which would declare a global variable?

To execute blocks of code depending on whether a condition is met, you use:

$_ is used by default:

Which is not used for assigning a value to a variable?

In relation to use strict; in Perl, a variable must be declared with which of the following keywords in order to use it for the first time?

In relation to identifier parsing in Perl, which of the following options is invalid?

Which statement is/are correct about the command paragraph of perlpod? i) The '=item' command should be used outside of the '=over'... '=back' region. ii) An '=item' should be the first thing after an '=over' command unless there are not going to be any items at all. iii) The '=headn' command cannot be put inside an '=over'... '=back' region.

Which option is less secure than the other, and should not be used for authentication?

What will be the output of the Perl code? $_ = 'Mark is to the left of red window.'; if ( /\b(red)\s+(\w+)/i ) { print '$2 follows $1.\n'; }