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Azure AI services subscription keys remain valid indefinitely until they are manually regenerated by an administrator. This is the correct answer. Unlike some cloud services that enforce automatic key rotation policies, Azure AI services subscription keys do not have a built-in expiration period. The keys continue to work unless: - An administrator explicitly regenerates them through the Azure portal - An administrator regenerates them via Azure CLI or API - The Azure AI services resource itself is deleted This design gives organizations flexibility to implement their own key rotation policies based on their security requirements. Microsoft does recommend regularly rotating keys as a security best practice, but this is not enforced automatically by the platform. Why the other answers are incorrect: The option suggesting 90-day automatic expiration is incorrect because Azure AI services keys do not expire automatically on any schedule. There is no forced 90-day rotation mechanism. The option mentioning 365-day validity with Azure Key Vault integration is incorrect. While Azure Key Vault can be used to manage secrets and implement rotation policies, subscription keys themselves do not have a 365-day expiration period by default, nor is Key Vault integration required for their management. The option stating 180-day expiration with Azure Active Directory policy extension is incorrect. Subscription keys do not have a 180-day expiration period, and Azure Active Directory policies do not control the expiration of Azure AI services subscription keys. These keys operate independently of AAD policy configurations for their validity period.