Which of the following BEST describes a public key cryptography architect?

A person sends a message that is encrypted by using their private key, and the receiver must also use that private key to decipher the message.

Messages are encrypted into cipher text and then are deciphered upon receipt by using a pair of public keys.

Messages are encrypted into cipher text and then are deciphered upon receipt by using a pair of secure private keys.

A person sends a message that is encrypted by the use of a public key, and the receiver can decipher the message using their private key.