根据《中华人民共和国反不正当竞争法》，下列情形不属于“不正当竞争行为”的是（）。

A.招标者与投标者相互串通抬高标价的

B.低于成本价处理有效期即将到期的商品的

C.以歧视性语言进行商品宣传的

D.地方政府限制外地商品进入本地市场的

Which function is not served by building a prototype ( )

A．It takes the place of the final system

B．It assists in gathering software requirements

C．It assists in estimating the cost of the project

D．It is used as the foundation of the larger projects