直接材料预算中的预计现金支出包括（）

A.上期采购的材料于本期支付的现金

B.本期采购的材料中由本期支付的现金

C.上期采购的材料金额中未能在当期支付的总金额

D.本期采购材料的总金额

If n is a positive integer, then n(n+1)(n+2) is （）.

A.even only when n is even

B.even only when n is odd

C.odd whenever n is odd

D.divisible by 3 only when n is odd

E.divisible by 4 whenever n is even