If Mary works in HR, then she works in Office A. If Mary does not work in HR, then she works for Fran. Based on the information above, which of the following statements MUST be true? radio_button_unchecked If Mary works in HR, she may have worked for Fran. radio_button_unchecked Mary works in Office A or she works for Fran. radio_button_unchecked If Mary works in HR, then she has never worked for Fran. radio_button_unchecked If Mary does not work in HR, she has never worked in Office A. radio_button_unchecked Mary sometimes works for Fran