Professor Willis loves interacting with her students, and she also enjoys her family.  When can she be reached during the semester?单项选择题

A

24/7 with no cut-off time

B

Monday - Friday (holidays are an exception) with a cut-off time of 4 pm on Friday

C

Monday - Thursday, with a cut-off time of 4 pm on Thursday

D

Sunday - Friday with a cut-off time of 12 noon on Friday

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