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Which of the following is not a proper way of how spammers get the email Ids?

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Which of the following is not a proper way of how spammers get the email Ids?

(a) When a user registers to online services, blogs, and sites

(b) Databases formed by spiders fetching email Ids from different sources

(c) From offline form fill-up documents

(d) Online ad-tracking tools

The question was asked in an online quiz.

My query is from Attack Vectors in chapter Understanding Attack Vectors of Cyber Security

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Correct choice is (c) From offline form fill-up documents

To explain: Spammers can get email IDs from sources such as data when a user registers to online services, blogs, and sites, databases formed by spiders fetching email Ids from different sources, online ad-tracking tools, email-ID extraction tools, spyware and cookies etc.

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