I need to secure an 18" wide, 84" tall floor cabinet to the wall, problem is there's only one stud behind it, 3.5" from the edge of the cab. The wall is 3/4" plaster or drywall (built in '65). What's the best anchor to go with?

There are so many anchor types out there, and I can't find a guide specific to cabinet installs that talks about which anchors to use. They all state that anchors are okay, but there are more than a few options.