Why are certificates preferred over pre-shared keys in an IPsec VPN?

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answerhappygod
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Why are certificates preferred over pre-shared keys in an IPsec VPN?

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Why are certificates preferred over pre-shared keys in an IPsec VPN?

A. Weak performancE. PSK takes more time to encrypt than Diffie-Hellman.
B. Weak Security: PSK are static and can be brute-forced.
C. Weak security: PSKs can only have 112 bit length.
D. Weak scalability: PSKs need to be set on each and every Gateway.
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