Hello.
The best answer would be D.
Have a nice day
Yea I could help , how u do this is I would write an essay about it the reason why there is a,b,c,d is because that is information u need to include into ur essay. don't forget to use transitions when u move to a next paragraph such as first, next ,thrid, lastly , in conclusion, and more u may search up:) I hope this helps and if u need any help of how to format writing ur essay plz text me and i will help :)
Answer:
a method of sending signals along a wire
