PLEASE HELP ME!!!!!!!!!!!!!!!! OUT OF TIME AND MY MIND HERE!!!!

What are the domain and range of the real-valued function f(x)=−2−−−−−√x+7?

Select one:
a. The domain is x≥−7x, and the range is f(x)≥−2.
b. The domain is x≥7x, and the range is f(x)≥−2
c. The domain is x≥−7x, and the range is all real numbers.
d. The domain is x≥−7x, and the range is f(x)≥2.