What configuration block defines the limit of a given secret in Vault?

The correct choice identifies the use of attributes within secret engine policies that control the limit on how many requests can be made and how long a secret can remain valid. The attributes "max_requests" and "max_lease" are crucial because they directly define the operational limits concerning how many times a secret can be accessed and for what duration it can be utilized before it must be renewed or revoked.

When configuring Vault, secret engines often include these policies to ensure access control and to enforce security best practices by limiting exposure and lifecycle management of secrets. Specifically, "max_requests" regulates how many times a secret can be requested, while "max_lease" determines the time-to-live (TTL) for the secret, making this option the most relevant in terms of managing secrets and their access lifecycle within Vault.

In contrast, attributes such as "max_duration" may pertain to other aspects not directly related to secret management, "max_tokens" relates to initialization processes which are foundational but do not specifically control secret limits, and "max_secrets settings" is not a standard term used in Vault related to secret limits. Hence, the most accurate answer involves the secret engine policies that employ max_requests and max_lease attributes to define operational limits within Vault.