Which of the following is true about the temporary credentials obtained through AssumeRoleWithSAML?

The temporary credentials obtained through AssumeRoleWithSAML do indeed expire after a set time period. When using the AssumeRoleWithSAML API call, AWS provides security through temporary credentials which have a limited lifespan. This is a fundamental aspect of AWS's approach to security, as it reduces the risk associated with long-lived credentials. The expiry period can be set when the temporary credentials are created, typically lasting from a few minutes up to several hours, depending on the settings specified by the AWS administrator. This feature helps ensure that even if the credentials are compromised, they can only be used for a limited duration.

Other options, such as those suggesting permanence or applicability across all AWS services, do not accurately reflect the nature of temporary credentials. While they can generally be used with various services, they're specifically designed for limited access and are not intended to be permanent or universally applicable without the proper configuration and permissions. Also, while Multi-Factor Authentication (MFA) can be a requirement depending on how roles and permissions are set up, it is not a given for all scenarios involving AssumeRoleWithSAML.