Liam works for a company that manufactures portable medical devices, such as insulin pumps. He is worried about ensuring these devices are secure. Which of the following is the most necessary step for him to take?

It is necessary for such systems to have all communications encrypted. As of the current date, breaches of portable network devices have all involved unencrypted communications. Option to ensure the devices have FDE is incorrect. Full-disk encryption (FDE) may or may not even be proper for such devices. Many do not have a disk to encrypt. Option to ensure the devices have individual antimalware is incorrect, too. It may be impossible to install antimalware on many such devices. Option to ensure the devices have been fuzz-tested is also incorrect. Fuzz testing is used for applications.