单选题Which of the following are suitable protocols for securing VPN connections at the lower layers of the OSI model?在OSI的低层模型中，以下哪项协议适合用于VPN的安全连接（）APKCS#10 and X.509BTLS and SSLCIPsec and L2TPDS/MIME and SSH
单选题
Which of the following are suitable protocols for securing VPN connections at the lower layers of the OSI model?在OSI的低层模型中，以下哪项协议适合用于VPN的安全连接（）
A
PKCS#10 and X.509
B
TLS and SSL
C
IPsec and L2TP
D
S/MIME and SSH
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