What command best describes how blocked file types can be managed from the command line? | Sharepoint 2010

A. stsadm -> blockedlist -extension <extension> - [add/delete]
B. stsadm -> blockedfilelist -extension <extension> - [add/delete]
C. stsadm -> blockedfilelist -ext <extension> - [add/delete]
D. stsadm -> blockedfilelist -extension <extension> - [add/delete]

Ans: B