关于对刑事诉讼中保证人罚款及救济途径，下列说法正确的是（）。

A、对保证人的罚款决定，公安机关应当向被取保候审人宣布，并告知其交纳保证金或重新提出保证人

B、保证人对罚款决定不服，可以在收到罚款决定书之日起5日内向作出取保候审决定的公安机关申请复核

C、公安机关应当告知保证人如果对罚款决定不服，可以向上一级公安机关申请复议

D、对上级公安机关撤销或者变更对保证人的罚款决定的，下级公安机关必须执行

A typical (66) language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to "spaceless" values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the (67) . In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having (68) results during expression evalution stored at the discretion of the language implementation, and effecting parameter (69) and (70) operations through value copying.

66（）

A．imperative

B．mandatory

C．compulsory

D．voluntary