You need to meet the network security requirements for the NSG flow logs.
Which type of resource do you need, and how many instances should you create? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

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You can store NSG flow logs from multiple NSGs in a single storage account. The NSGs and the SA have to be in the same region and subscription though.
https://learn.microsoft.com/en-us/azure/network-watcher/nsg-flow-logs-overview
Min No. of instant required: One instant