CLI Command to create a VM in Basic Tier or Standard Tier

Hi,

I tried creating some VM's using the CLI commands. The VM's got created and were getting listed in the Portal. But all of these were of Standard Tier. I have not mentioned in the CLI command anywhere about the Tier. Is it by default that a VM gets created in Standard Tier?? Or do we have any command in CLI to specify it at the time of creation to instruct it to be created under the Basic Tier?

This is the command that i use to create a VM,

azure vm create <dnsname> <imageid>  --location "East US" <username> <password> --vm-size extrasmall

Kindly suggest

Thanks

Anish