以下关于AI3新型金税卡月可抄取的最大开票量的说法中正确的是（）。

A.当使用32KIC卡时，月最大开票量为630×40张；当使用64KIC卡时，月最大开票量为1350×40张

B.当使用32KIC卡时，月最大开票量为630张；当使用64KIC卡时，月最大开票量为1350张

C.当使用32KIC卡时，月最大开票量为630×3张；当使用64KIC卡时，月最大开票量为1350×3张

D.当使用32KIC卡时，月最大开票量为630×7张；当使用64KIC卡时，月最大开票量为1350×7张

Prior to the UML, there was no clear leading （） language. Users had to choose from among many similar modeling languages with minor differences in overall （） power. Most of the modeling languages shared a set of commonly accepted concepts that are expressed slightly differently in various languages. This lack of （） discouraged new users from entering the OO market and from doing OO modeling, without greatly expanding the power of modeling. Users longed for the industry to adopt one, or a very few, broadly supported modeling languages suitable for （） usage. Some vendors were discouraged from entering the OO modeling area because of the need to support many similar, but slightly different, modeling languages. In particular, the supply of add-on tools has been depressed because small vendors cannot afford to support many different formats from many different （） modeling tools. It is important to the entire OO industry to encourage broadly based tools and vendors, as well as niche products that cater to the needs of specialized groups.

This lack of （） discouraged new users

A．agreement

B．understanding

C．characteristic

D．diversity