Question: What action may a network slice subnet provisioning provider take if an existing Network Slice Subnet Instance (NSSI) matches the requirements of a provisioning request from a MnS consumer?
Option 1: Reject the request due to potential resource overcommitment.
Option 2: Automatically create a new NSSI without checking existing ones.
Option 3: Modify an incompatible existing NSSI to fit the requested capabilities.
Option 4: Allocate the matching existing NSSI, if resources are available.
Explanation: This is the correct answer because, according to the described process, if an existing NSSI's actual capabilities match the requirements of the request, it is eligible for allocation, provided that sufficient resources are available. This approach optimizes resource utilization by reusing suitable existing infrastructure before creating new instances.