商业银行在证券机构派出临时柜台说法正确的是（）：

A.每个临时配备人数不得少于两人，必须熟悉核心系统系统操作

B.临时柜台办理业务对象仅为个人客户

C.临时柜台只可以配备转讫章、柜台业务章（对私）

D.临时的存续期限不超过6个月，从正式获准并设立临时柜台之日起计算

Watch a baby between six and nine months old, and you will observe the basic concepts of geometry being learned. Once the baby has mastered the idea that space is three-dimensional, it reached out and begins grasping various kinds of objects. It is then, from perhaps nine to fifteen months, that the concepts of sets and numbers are formed. So far, so good. But now an ominous development takes place. The nerve fibers in the brain insulate themselves in such a way that the baby begins to hear sounds very precisely. Soon it picks up language, and it is then brought into direct communication with adults. From this point on, it is usually downhill all the way for mathematics, because the child now becomes exposed to all the nonsense words and beliefs of the community into which it has been so unfortunate as to have been born. Nature having done very well by the child to this point, having permitted it the luxury of thinking for itself for eighteen months, now abandons it to the arbitrary conventions and beliefs of society. But at least the child knows something of geometry and numbers, and it will always retain some memory of the early happy days, no matter what vicissitudes it may suffer later on. The main reservoir of mathematical talent in any society is thus possessed by children who are about two years old, children who have just learned to speak fluently.

At what age does a child probably begin to learn about sets and numbers().

A. Six months.

B. Eighteen months.

C. Fifteen months.

D. Nine months.