Explanation
One of the major changes that you will face when you move from on-premises cloud to the public cloud is the switch from capital expenditure (buying hardware) to operating expenditure (paying for service as you use it).
This switch also requires more careful management of your costs. The benefit of the cloud is that you can fundamentally and positively affect the cost of a service you use by merely shutting down or resizing it when it's not needed.
https://docs.microsoft.com/en-us/azure/architecture/cloud-adoption/appendix/azure-scaffold

Explanation
Box 1: Yes
An Azure free account has a spending limit. This is currently 200 USD or 150 GBP.
Box 2: No
Azure free account has a 5 GB blob storage limit and a 5 GB file storage limit.
Box 3: No
Azure free account has a limit of 10 web, mobile or API apps
References:
https://azure.microsoft.com/en-us/free/
https://azure.microsoft.com/en-us/free/free-account-faq/
https://docs.microsoft.com/en-us/azure/billing/billing-avoid-charges-free-account
https://azure.microsoft.com/en-us/free/free-account-faq/
https://docs.microsoft.com/en-us/azure/billing/billing-avoid-charges-free-account

Explanation

Explanation
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Reference:
https://docs.microsoft.com/en-us/azure/virtual-network/network-security-group-how-it-works

Explanation
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