PLEASE HELP (:
A student is planning a camping trip and wants to take a few electronic device along. Her flexible portable solar panel converts electromagnetic energy from the sun into electrical energy at a rate of 21,600 J/h. Which devices could she charge with it at one time?

a. All three devices
b. The AA/AAA battery charger
c. The PDA charger or the cell phone charger separately, but not both together
d. Both the cell phone charger and the PDA charger together