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Which of the following uses an authentication device?

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Which of the following uses an authentication device?

(a) Amazon Elastic MapReduce

(b) Amazon Mechanical Turk

(c) Amazon DevPay

(d) Multi-Factor Authentication

This question was addressed to me in homework.

Question is from Amazon Machine Images topic in section AWS – Amazon Web Services and Microsoft Cloud Services of Cloud Computing

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Right choice is (d) Multi-Factor Authentication

Explanation: Multi-Factor Authentication gives you two layers of protection: your user id and password.

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