Final answer:
An Azure service in general availability is available to all Azure customers, not just a subset, and is ready for production use with full support and SLAs.
Step-by-step explanation:
The statement that an Azure service in general availability is released to a subset of Azure customers is False. When an Azure service reaches general availability (GA), it means that the service is available to all Azure customers. This follows various stages of release, including a private preview, where it is available to a limited number of users, and a public preview, where it's available to all customers but not yet recommended for production use. Once a service enters GA, it is deemed ready for production use and is supported by standard service level agreements (SLAs).