please help!

Show how a message M can be digitally signed and encrypted by Bob when sending the message to Alice for her eyes only? (Message is being prepared to just send to Alice.) A. Create a message hash, encrypt the hash with Bob's private key and thenencrypt that result with Alice's public key before sending B. Create a message hash, encrypt the hash with Bob's public key and then encrypt that result with Alice's public key before sending C. Create a message hash, encrypt the hash with Bob's private key and then encrypt that result with Alice's private key before sending D. Encrypt message M with Bob's private key and then encrypt that result with Alice's public key before sending