Dana has a system for keeping herself organized. She uses sticky notes on her desk where she works to write down tasks she needs to do immediately. For tasks that need to be done sometime this week, she uses a small whiteboard on the wall in her room. For tasks that don't need to be done until next month, she uses a notepad that she keeps downstairs in the living room. In this scenario, which type of storage would be equivalent to the sticky notes?
A) main memory
B) processor
C) secondary memory
D) register​