单选题Which Application Layer security protocol requires two pair of asymmetric keys and two digital certificates?以下那个应用层协议需要两对非对称秘钥和两个数字证书（）ASSLBPEMCS/HTTPDSET
单选题
Which Application Layer security protocol requires two pair of asymmetric keys and two digital certificates?以下那个应用层协议需要两对非对称秘钥和两个数字证书（）
A
SSL
B
PEM
C
S/HTTP
D
SET
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