What is nomophobia?

I - Nomophobia is a new disease caused by excessive use of mobile phones.
II - The lack of a mobile phone can cause discomfort in people with nomophobia.
III - People with nomophobia have high self-esteem and are not concerned with being accepted by others.
IV - The nomophobia can affect the academic or work performance of the person.
a) Only I and II are correct.
b) Only II and IV are correct.
c) Only I, II and IV are correct.
d) Only II, III and IV are correct.