Which technology enhances the security of cloud transactions?

Single sign-on (SSO) enhances the security of cloud transactions by allowing users to authenticate once and gain access to multiple related systems without needing to log in separately to each system. This simplifies the user experience while also reducing the risk associated with password fatigue, where users might create weaker passwords or reuse passwords across different platforms.

In the context of cloud transactions, SSO helps mitigate the chance of unauthorized access by enforcing centralized authentication and reducing the number of times credentials are entered, which diminishes the risk of interception. Additionally, SSO solutions often implement advanced security measures such as multi-factor authentication (MFA), which further strengthens security during transaction processes.

The other options, while important in their own right, do not specifically enhance the security of cloud transactions in the same direct manner. Virtual machines provide isolation and resource management, cloud orchestration helps automate and manage cloud services, and backup solutions are vital for data recovery purposes but do not contribute directly to securing the authentication process for transactions.