A. As a former medical equipment repair person I can tell you that this exploit is overrated.
Should it be fixed, yes. Should security be taken seriously, yes.
Up until 10 years ago there wasn't even connected infusion pumps, and those were dangerous because a nurse could very easily make a 10x medication error. She wants to put in 10 ML per hour and accidentally puts in either 1 or 100. Or she could press STOP instead of START because they were located right next to each other. Neither would give you a warning or an error message.
Today's pumps have drug databases with pre-defined ranges set by pharmacy. Can they override the setting, yes but it is logged and and noted in the system.
This tech is saving so many more lives every year, it was well worth it. It also reduces the malpractice insurance by large sums of money. They are getting a return on investment and a payoff date to upgrade to this tech by insurance savings only.
Can someone hack it, and kill a patient; Theoretically. But they would have to find the exact unit that is on the patient and there could be hundreds if not thousands of these in any given hospital and they never stay in one place. These move multiple times per day. They would still need to gain physical access to the unit, and the medicine would have to be lethal anyway if overdosed. Then there will be some sort of record because these update via wifi with alarms. Could they hack it and delete all evidence? Sure, but that would cause physical evidence, with bags being too empty too quickly.