The following interactions between binary and continuous variables are possible, with the exception of
A) Yi = ?0 + ?1Xi + ?2Di + ?3(Xi × Di) + ui.
B) Yi = ?0 + ?1Xi + ?2(Xi × Di) + ui.
C) Yi = (?0 + Di) + ?1Xi + ui.
D) Yi = ?0 + ?1Xi + ?2Di + ui.
Answer: C
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