How do you solve this?

5. Alice and Bob are communicatirg using an asymenetric orvptosystem Each of them has a public key and a private key, and theyknowi each other's public keys. To decryption' A. Alice sends Boba secret message only he can read. What key does Alice use to do what operation in order to make the ciphertext? What key does Bob ise to do what operatian in order to recover the plaintext? B. Alice sends Bob an authenticated message anyone can read and anyone can verify she must have sent. What hey does Alice ine to do what operation in order to make the rignature? What key does Bob ise to do what operation in order to verify the sigature