Horizontal scaling=adding more compute instances(servers) ,usually of same type
Vertical scaling=adding more compute power(RAM, storage,etc) to single instance
A is correct.
https://docs.oracle.com/en/solutions/oci-best-practices/manage-changes-demand1.html#GUID-FBE50E2A-F970-4B8F-A8E7-F428B1C865C0 precises : “Horizontal scaling mean adding more compute instances for your workload.”
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