Rule 2 is blocking HTTPS access (port 443) and has a priority of 500.
Changing Rule 5 (ports 50-5000) and giving it a lower priority number will allow access on port
443.
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.
Incorrect Answers:
A: Rule 2 is blocking HTTPS access (port 443) and has a priority of 500. Creating a rule for the same protocol (443) with a higher priority number will not help.
C: Rule 1 blocks access to port 80, which is used for HTTP, not HTTPS.
D: Rule 2 is blocking HTTPS access (port 443). Changing Rule 4 allows access on UDP but is a higher priority number than Rule. Changing the protocol on Rule 4 to TCP will not help if we don't also change the priority to a lower number.
References:
https://docs.microsoft.com/en-us/azure/virtual-network/security-overview