PGP, SSL, and IKE are all examples of which type of cryptography?

A.
Public Key

B.
Secret Key

C.
Hash Algorithm

D.
Digest

Explanation:
Public-key algorithms are fundamental security ingredients in cryptosystems, applications and protocols. They
underpin various Internet standards, such as Secure Sockets Layer (SSL),Transport Layer Security (TLS), S/
MIME, PGP, Internet Key Exchange (IKE or IKEv2), and GPG.
https://en.wikipedia.org/wiki/Public-key_cryptography