You received an e-mail message from a co-worker- It includes a .zip file as an attachment. The e-mail message explains that the attachment updates a critical flaw in the operating system and provides detailed instructions for installing the program. Which step should you perform first?

A.
Save the file to your desktop before opening it.

B.
Download the same program from the Internet, then install it.

C.
Call the IT department and verify the nature of the attached file.

D.
Open the attached file, which is safe because the e-mail server would have deleted it if it were dangerous.