All of the following are true about $5G,$ or fifth generation of cellular networks except:

a$.$ Taking advantage of $5G$ requires significant investment

b$.$ It does not mean that a hospital can serve more patients

c$.$ Downloading a movie takes about $25$ seconds, as compared to the $10$ minutes it took over $4G$

d$.$ It supports lightning fast internet speeds, of at least $20$ gigabits per second