根据融券融资业务的相关要求，客户融资买入证券时，融资保证金比例不得低于( )。

A．三分之一

B．二分之一

C．100%

D．200%

All of the following are true about the product life cycle EXCEPT:

A．It is collection of generally sequential, non-overlapping product phase

B．The last product life cycle phase for a product is generally the product’s deterioration and deat

C．Generally, a project life cycle is contained within one or more product life cycle

D．Generally, a project life cycle contains one or more product life cycle