Which of the following facts about Alexa are correct?

Submitted by: Administrator
► a. Alexa provides free data on relative website visitor traffic
► b. Alexa and Quantcast provide information on visitor household incomes
► c. Alexa is biased towards US based traffic
► d. Quantcast only tracks people who have installed the Quantcast toolbar

a. Alexa provides free data on relative website visitor traffic
Submitted by: Administrator

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