The qualities that boys and girls consider important in a friend can be the same, ______ their family background or educational level. And ______ Tongtong, coming from Mianyang, he has a close friend to accompany him.

A．in spite of; lucky for

B．instead of; fortunate to

C．regardless of; luckily for

D．in place of; fortunately to

在进行网上交易时，信用卡的帐号和用户名、证件号码等被他人知晓，这是破坏了信息的（）。

A.完整性

B.身份的可确定性

C.有效性

D.保密性