Chaz Finnerty Called the IT Help Desk in a Huff

Multiple Choice

Chaz Finnerty called the IT Help Desk in a huff."I'm trying to open an Excel file and I get a message that says that the file is locked for editing.What's going on?" The answer is that

A) the file is corrupted due to a computer virus.
B) there is no problem.Chaz is editing the file,so it is locked..
C) concurrent update controls have locked the file.
D) Chaz didn't open the file with the appropriate program.