Ivan is interested in becoming an engineer in the field of improving communication technology. He hasn't yet decided if he wants to focus more on the hardware or software side of the technology. What would Ivan be studying if he focused on software?

A. the soft parts of the technology, such as the rubber coating around the wires
B. the antenna within the technology that sends and receives the data
C. the computer that runs the physical parts of the technology
D. the programming that makes the physical parts of the technology run​