Which of the following is considered a "sharp"
a. all of the answer choice
b. needles
c. razor blades
d. scalpels

Base on the following choices, the one that is considered to be sharp is all of the above which is letter a. It is because needles are sharp enough to penetrate the skin, as well as razor blades and even scalpels, and by that, all of them are all considered to be sharp.

They need to know because sometimes they have a symptom

Well, l think that some effective communication is, emotional barriers and lack of attention, interest distraction or irrelevance. also some physical disabilities such as hearing problems or speech difficulties.      l hope i am correct  and you good luck.