The correct answer is scalable.
A cloud service that supports a maximum of 20 instances is more scalable than a service that supports a maximum of five instances. Scalability refers to the ability of a system to handle increased workload by adding resources to the system. In this case, a cloud service that supports a maximum of 20 instances can handle more workload than a service that supports a maximum of five instances, making it more scalable.
Here are the reasons why the other options are incorrect:
Distributed: A distributed system is one in which components are located on different networked computers and communicate and coordinate their actions by passing messages. While a cloud service can be distributed, the number of instances it supports does not determine whether it is distributed or not.
Secure: Security refers to the measures taken to protect a system from unauthorized access or attack. While security is an important aspect of cloud services, the number of instances it supports does not determine whether it is secure or not.
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