Maria is using accounting software to compile sensitive financial information. She receives a phone call and then momentarily leaves her desk. While she's gone, Bill walks past her cubicle and sees that she has not locked her desktop and left data exposed. Bill uses his smartphone to take several photos of this data with the intent of selling it to the company's competitor. What access control compromise is taking place?

Gaining physical access

Accessing networks

Eavesdropping by observation

Exploiting hardware and software