$13$ Which of the following statement is NOT correct $($Choose one answer$)?$

a$.$ Ultra$-$small medical sensors$/$actuators can be either worn or implanted inside the body to collect or deliver a variety of medical information and services.

b$.$ Wearable sensors allow for various medical$/$physiological monitoring $($e$.$g$.,$ electrocardiogram, temperature, respiration, heart rate, and blood pressure$)$

c$.$ A simple example of BAN application would be a device equipped with a built$-$in reservoir and pump. This device can administer just the right amount of insulin to a diabetic person based on wirelessly.

d$.$ The Body Area Network $($BAN$)$ is a technology that connects groups of computers over large distances.