Which of the following is a more efficient form of public key cryptography as it demands less computational power and offers more security per bit?

Which of the following is a more efficient form of public key cryptography as it demands less computational power and offers more security per bit?
A . Diffie-Hellman Key Agreement
B . Digital Signature Standard
C . Secret Key Cryptography
D . Elliptic Curve Cryptography

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Answer: D