单项选择题

给定日期DD,可以计算该日期当月最大天数的正确表达式是______.

A.Day(DD)
B.Day (Date Serial(Year(DD) Month(DD) ,day(DD) ))
C.Day (Date Serial(Year(DD) Month(DD),0))
D.Day(Date Serial(Year(DD) ,Month(D D)+1,0))