单选题

Which of the following calendaring syntax expressions would evaluate to the last day of every month？（）

A FREQ = MONTHLY； BYMONTHDAY = 31

B FREQ = MONTHLY； BYMONTHDAY = -1

C FREQ = DAILY； BYDAY = -1

D FREQ = MONTHLY； BYDAY = 31

E FREQ = DAILY； BYMONTHDAY = LAST_DAY

略

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