Incorrect Answers:
A: 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. RDP already has the lowest number and thus the highest priority.
B: The network interface has already been added to VM.
C: The Outbound rules are fine.
Reference:
https://docs.microsoft.com/en-us/azure/virtual-network/security-overview