在因特网上,利用银行卡进行支付的核心问题是()
A.如何保证信息真实性和准确性
B.如何保证网络的安全性和银行卡的合法性
C.如何保证银行卡的合法性和有效性
D.如何保证支付信息的安全传输和身份认证
正确答案是D
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Children may go on the trip only with the permission of their parents or ( ). (guard)