Explanation
Instead you should delete VM1. You recreate VM1, and then you add the network interface for VM1.
Note: When you create an Azure virtual machine (VM), you must create a virtual network (VNet) or use an existing VNet. You can change the subnet a VM is connected to after it's created, but you cannot change the VNet.
References:
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/network-overview

Section: [none]
Explanation/Reference:
https://docs.microsoft.com/en-us/azure/aks/kubernetes-walkthrough

To port forward traffic to a specific port on specific VMs use an inbound network address translation (NAT) rule.
https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-overview an inbound NAT rule :
Create a load balancer inbound network address translation (NAT) rule to forward traffic from a specific port of the front-end IP address to a specific port of a back-end VM.
Hence this option is Correct
a load balancing rule : Incorrect Choice
A load balancer rule defines how traffic is distributed to the VMs. The rule defines the front-end IP configuration for incoming traffic, the back-end IP pool to receive the traffic, and the required source and destination ports.
a new public load balancer for VM3 : Incorrect Choice
This option will not help you since this will route all traffic to VM3 only.
a frontend IP configuration : Incorrect Choice
When you define an Azure Load Balancer, a frontend and a backend pool configuration are connected with rules. The health probe referenced by the rule is used to determine how new flows are sent to a node in the backend pool. The frontend (aka VIP) is defined by a 3-tuple comprised of an IP address (public or internal), a transport protocol (UDP or TCP), and a port number from the load balancing rule. The backend pool is a collection of Virtual Machine IP configurations (part of the NIC resource) which reference the Load Balancer backend pool.
References:
https://docs.microsoft.com/en-us/azure/load-balancer/tutorial-load-balancer-port-forwarding-portal
https://pixelrobots.co.uk/2017/08/azure-load-balancer-for-rds/

Section: [none]
Explanation:
The azcopy copy command copies a directory (and all of the files in that directory) to a blob container. The result is a directory in the container by the same name.
Incorrect Answers:
B: The azcopy sync command replicates the source location to the destination location. However, the file is skipped if the last modified time in the destination is more recent.
D: The az storage blob copy start-batch command copies multiple blobs to a blob container.
Reference:
https://docs.microsoft.com/en-us/azure/storage/common/storage-use-azcopy-blobs
https://docs.microsoft.com/en-us/azure/storage/common/storage-ref-azcopy-copy

References:
https://azure.microsoft.com/en-au/pricing/details/app-service/windows/
https://azure.microsoft.com/en-gb/pricing/details/app-service/plans/