Algebra finance

A set of twins have agreed to take part in an observational study. Each of the twins will wear a microphone that will record every interaction that they have for a week. Which choice best describes this situation?

A.
covert and structured

B.
covert and unstructured

C.
overt and structured

D.
overt and unstructured

I think it D but I'm not quite sure can someone help please thank you!!

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