Which of the following is a secondary authentication type used in CyberArk?

The correct answer indicates that CyberArk can be considered a secondary authentication type within its suite of identity management features. In CyberArk's architecture, secondary authentication is a crucial security measure that supplements primary authentication methods. It provides an additional layer of verification, which is essential when accessing sensitive information and managing privileged accounts.

While primary methods, such as Windows authentication, are straightforward and often used as the first line of defense, secondary methods help to fortify security. CyberArk’s own authentication mechanisms can include multifactor options and other tailored approaches that enhance the protection of privileged accounts.

The other listed options represent various technologies and methods relevant to authentication but do not fall under the category of secondary types as defined by CyberArk's framework. For instance, PKI (Client certificate) is a public key infrastructure that can be utilized for secure communications but does not directly relate to CyberArk’s native secondary authentication methods. Windows refers to a primary form of authentication used in many environments. IIS (Internet Information Services) pertains to web server functionalities, which does not explicitly denote a method of secondary authentication within the CyberArk ecosystem.

Therefore, CyberArk as an option signifies the internal methods the platform employs to ensure robust security for its users.