A. Diffie-hellman (DH) key exchange: DH (>=2048 bits)
Symmetric Key: Advanced Encryption Standard (AES) > 128 bits
Digital Signature: Rivest-Shamir-Adleman (RSA) (1024 bits)
B. Diffie-hellman (DH) key exchange: DH (>=2048 bits)
Symmetric Key: Advanced Encryption Standard (AES) > 128 bits
Digital Signature: Digital Signature Algorithm (DSA) (>=2048 bits)
C. Diffie-hellman (DH) key exchange: DH (<= 1024 bits)
Symmetric Key: Blowfish
Digital Signature: Rivest-Shamir-Adleman (RSA) (>=2048 bits)
D. Diffie-hellman (DH) key exchange: DH (>=2048 bits)
Symmetric Key: Advanced Encryption Standard (AES) < 128 bits
Digital Signature: Elliptic Curve Digital Signature Algorithm (ECDSA) (>=256 bits)