Incorrect Answers:
B: The network interface has already been added to VM.
C: The Outbound rules are fine.
D: The inbound rules are fine. Port 3389 is used for Remote Desktop. Note: Rules are processed in priority order, with lower numbers processed before higher numbers, because lower numbers have higher priority. Once traffic matches a rule, processing stops. As a result, any rules that exist with lower priorities (higher numbers) that have the same attributes as rules with higher priorities are not processed.
References: https://docs.microsoft.com/en-us/azure/virtual-network/security-overview