Question: Alice posts a public key that matches a private key only she knows. How does Bob encrypt a message that only Alice can read? Bob

Alice posts a public key that matches a private key only she knows. How does Bob encrypt a message that only Alice can read?
Bob encrypts the message using the public key provided by Alice.
Bob encrypts the message using the private key provided by Alice.
Bob encrypts the message using both the public and private key provided by Alice.
Bob decrypts the messege using the private key provided by Alice.
Alice posts a public key that matches a private

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