The $21$st Century Cures Act's main purpose is best described by which of the following? A$.$ Improve efficiency in developing new medical treatments by encouraging more efficient sharing of electronic health records. B$.$ Require the development of enhanced annual privacy notices for patients undergoing treatment for serious illnesses. C$.$ Incentivize healthcare organizations to restrict sharing of health records, even when such sharing is legal. D$.$ Better secure PHI for patient who have recovered from serious illnesses.