Explanation:

Box 1: on-error
Policies in Azure API Management are divided into inbound, backend, outbound, and on-error.
If there is no on-error section, callers will receive 400 or 500 HTTP response messages if an error condition occurs.
Box 2: context
Box 3: context
Box 4: set-status
The return-response policy aborts pipeline execution and returns either a default or custom response to the caller. Default response is 200 OK with no body.
Custom response can be specified via a context variable or policy statements.
Syntax:
<return-response response-variable-name="existing context variable">
<set-header/>
<set-body/>
<set-status/>
</return-response>
Box 5: on-error
Reference:
https://docs.microsoft.com/en-us/azure/api-management/api-management-error-handling-policies
https://docs.microsoft.com/en-us/azure/api-management/api-management-transformation-policies

Explanation
Graphical user interface, text, application, email Description automatically generated

Explanation


Box 1: keyvault
Create an Azure Key Vault with az keyvault create and enable the Key Vault for use with disk encryption.
Specify a unique Key Vault name for keyvault_name as follows:
keyvault_name=myvaultname$RANDOM
az keyvault create \
--name $keyvault_name \
--resource-group $resourcegroup \
--location eastus \
--enabled-for-disk-encryption True
Box 2: keyvault key
The Azure platform needs to be granted access to request the cryptographic keys when the VM boots to decrypt the virtual disks. Create a cryptographic key in your Key Vault with az keyvault key create. The following example creates a key named myKey:
az keyvault key create \
--vault-name $keyvault_name \
--name myKey \
--protection software
Box 3: vm
Create a VM with az vm create. Only certain marketplace images support disk encryption. The following example creates a VM named myVM using an Ubuntu 16.04 LTS image:
az vm create \
--resource-group $resourcegroup \
--name myVM \
--image Canonical:UbuntuServer:16.04-LTS:latest \
--admin-username azureuser \
--generate-ssh-keys \
Box 4: vm encryption
Encrypt your VM with az vm encryption enable:
az vm encryption enable \
--resource-group $resourcegroup \
--name myVM \
--disk-encryption-keyvault $keyvault_name \
--key-encryption-key myKey \
--volume-type all
Note: seems to an error in the question. Should have enable instead of create.
Box 5: all
Encrypt both data and operating system.
References:
https://docs.microsoft.com/bs-latn-ba/azure/virtual-machines/linux/encrypt-disks

トピック クライアントを使用して、エンティティから継続的にメッセージを受信するために使用される RegisterMessageHandler を呼び出します。メッセージ ハンドラーを登録し、メッセージを受信するための新しいスレッドを開始します。このハンドラーは、受信者が新しいメッセージを受信するたびに待機されます。
subscriptionClient.RegisterMessageHandler(ReceiveMessagesAsync、messageHandlerOptions);
参照：
https://www.c-sharpcorner.com/article/azure-service-bus-topic-and-subscription-pub-sub/