Inthevideoform.theOrderDatefield(WhichshowsWhenthevideomaybeordered)iscalculatedbasedontheDatefield(Whichdisplaysthereleasedate).Theorderdateis30dayspriortothereleasedate.WhichonethefollowingformulaswillcalculatetheOrderDatevalue?（）
A.@Number(Date)-30
B.@Adjust(Date;0;0;30;0;0;0)
C.@Adjust(Date;0;0;-30;0;0;0)
D.@If(Date!=;Date-30;@Failure(Thereisnocurrentreleasedate))
参考答案：C
