When requiring certificates for mobile devices, which authentication method must be set?

The correct answer involves the use of SecurID, specifically referring to the technology developed by RSA that facilitates two-factor authentication through security tokens. In the context of requiring certificates for mobile devices, SecurID enhances security by ensuring that users not only provide a password or PIN but also possess a physical token that generates a one-time password.

This method significantly strengthens the authentication process for accessing resources on mobile devices, especially in environments where data security is crucial. It is essential in scenarios where organizations deploy sensitive applications on mobile devices and require robust user identity verification.

In contrast, while SecureID is a commonly understood term, it appears to be a misspelling or variation and does not refer to a specific recognized method. The other options, like Complexity and TacAcs, relate to different aspects of security. Complexity typically pertains to password requirements and would not directly address certificate usage for mobile device authentication. TacAcs (Terminal Access Controller Access-Control System) is a protocol used for network device administration but does not inherently apply to mobile device certificate authentication.

Thus, the necessity for dynamic, two-factor authentication inherent in SecurID aligns perfectly with the requirements for securing mobile device access through certificates.