What are disadvantages to IrDA?

One of your clients uses a wireless IrDA printer with her laptop. Which of these is a disadvantage of IrDA connections?

A) Won’t work when there’s no line-of-sight

B) Susceptible to interference from microwave ovens and other RFI

C) Does not work with all applications

D) Requires a mobile broadband connection

E) Gets frizzy when the humidity is high