24. Suppose that Bob and Alice want to send information to each other with the RSA algorithm. Which of the following statements are correct? 1.Bob must know Alice's public key to encrypt the message. 2.Alice must use her private key to decrypt the encrypted message from Bob. 3.Alice can use her own private key to send a signed message to Bob with a signature. 4.Bob can verify the signature with Alice's public key. 5.If someone has Alice's public key, he can forge Alice's sigature. (A) 1,2,3,4,5 (B)1,2,3,4 (C)3,4 (D)1,2,5