Question: If userA sends a secure message to userB using an asymmetric cryptographic algorithm, and userB sends a reply, what key is used if userA wants

If userA sends a secure message to userB using an asymmetric cryptographic algorithm, and userB sends a reply, what key is used if userA wants another user, userC to read the reply message?

userB's private key

userC's public key

userA's public key

userC's private key

If userA sends a secure message to userB using an asymmetric

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