To answer this question, we need to understand the different switches used in Perl for printing out warnings about typographical errors in a script.

Option A) -P - This option is incorrect because the -P switch in Perl is used for enabling parsing of files with the .P extension. It does not relate to printing out warnings about typographical errors.

Option B) -W - This option is incorrect because the -W switch in Perl is used to enable all warnings, including additional warnings not covered by the -w switch.

Option C) -p - This option is incorrect because the -p switch in Perl is used to add a loop around your script, which makes it iterate over input lines and automatically prints each line.

Option D) -w - This option is correct because the -w switch in Perl is used to enable warnings. When enabled, it prints out warnings about typographical errors in your script.

Therefore, the correct answer is D) -w. This option is correct because it is used in Perl to print out warnings about typographical errors in your script.

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• Wrong explanation

To answer this question, you need to understand the naming convention for scalar variables in Perl.

Option A) # - This option is incorrect because the # sign is used to indicate comments in Perl, not for naming variables.

Option B) @ - This option is incorrect because the @ sign is used to denote arrays in Perl, not for scalar variables.

Option C) % - This option is incorrect because the % sign is used to denote hashes in Perl, not for scalar variables.

Option D) $ - This option is correct because scalar variables in Perl always begin with the $ sign. Scalar variables hold single values, such as numbers or strings.

The correct answer is D. This option is correct because scalar variables in Perl are always denoted by the $ sign.

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• Wrong explanation