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Which of the following is not possible compression value?

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Which of the following is not possible compression value?

(a) identity

(b) deflate

(c) compress

(d) DNS

This question was addressed to me at a job interview.

I'd like to ask this question from Web Performance Optimization in portion HTML Images & Web Page Files of HTML

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Correct choice is (d) DNS

Explanation: A identity indicates no compression. Compress is a method that uses UNIX compress, it is based on LZW algorithm. Gzip is the most famous compression format, deflate is a kind of gzip without checksum header, it is little faster but less efficient. DNS stands for Domain Name System and is a naming system in computers.

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