In Okunland,a Country That Operates According to Okun's Law,actual GDP

In Okunland,a country that operates according to Okun's law,actual GDP equals $7,520 billion,potential GDP equals $8,000 billion and the natural unemployment rate is 5%.What is the actual rate of unemployment in Okunland?

A) 2%.
B) 3%.
C) 5%.
D) 7%.
E) 8%.