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Suppose I have a dataframe called statclass containing everyone in the class's name, email, carmen_ID, and grade (labelled as such). What is the primary way

Suppose I have a dataframe called "statclass" containing everyone in the class's name, email, carmen_ID, and grade (labelled as such). What is the primary way to access the email variable?

A. statclass_email

B. statclass$email

C. statclass(email)

D. statclass[email]

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