问题：
[单选题]47、 When deploying an IPsec site-to-site VPN what is the vecommended method of peer anthentication from a security perspeceive?从安全的角度考虑，当配置一个IPSec站点到站点的VPN的对端验证时，推荐的方法是什么?
A. Pre-shared keys 预共享密钥
B. Digital certificates 数字证书
C. Biometrics
D. OTP
答案解析：
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