Your team is now developing applications. They are built around docker containers. You are planning to push the images and store them in the Azure container registry. Several application environments in Azure would then pull these images and run them as containers. 
You have to ensure service principals are used to access the Azure container registry. You have to provide the credentials for the service principal and ensure that they are stored in an existing Azure key vault instance. 
You have to complete the below Azure CLI command to implement this requirement. 

Which of the following would go into Slot 1?

Answer options:

A.az keyvault set
B.az keyvault secret set
C.az ad sp create-for-rbac
D.az ad create

Answer – B 
Here we have to set the value of the secret in the key vault. 
An example of this is given in the Microsoft documentation. 

Since this is clearly mentioned in the Microsoft documentation, all other options are incorrect. 
For more information on an example on Azure container registry tasks, please refer to the following link- 

https://docs.microsoft.com/en-us/azure/container-registry/container-registry-tutorial-quick-task