Which of the following is used to initially create trust between a Gateway and Security Management Server?

The correct choice for establishing initial trust between a Gateway and a Security Management Server is the use of a One-time Password (OTP).

In a security framework, establishing trust is essential for secure communications between different components. The OTP serves as a temporary authentication method that provides a secure way to authenticate the Gateway to the Security Management Server during the critical initial setup phase. It is a unique password that is valid for only one session or transaction, which enhances security by limiting the time frame in which it can be used.

The other options, while related to trust and security, play different roles in the overall architecture. Certificates are typically utilized to maintain ongoing secure communication after trust has been established. An Internal Certificate Authority may issue certificates but is not directly involved in the initial trust establishment process. Although tokens can facilitate authentication, they generally do not provide the same level of immediate trust establishment as a one-time password does in this specific context.