Which of the following statement is true? a. Asymmetric encryption is faster than symmetric encryption b. Symmetric encryption uses hash algorithms to create cipher block chains c. Symmetric encryption has significant key management challenges d. Asymmetric encryption works best for streaming data streams Who can decrypt a message that Bob encrypts using his private key a. No one b. Only the intended recipient can decrypt the message c. Anyone who has a copy of Bob's public key d. Anyone who has a copy of Bob's private key