What does this command provide?

One of your associates is troubleshooting a system, and he uses the command ‘sfc.’ What does this command provide?

A) Check the operating system files for corruption or modifications

B) Document the hops between two devices across the network

C) Resolve an IP address from a hostname

D) Locate bad sectors on the hard drive

E) He’s just typing random letters, hoping to somehow run across a magical solution