solve this question

Which of the following gives -y f(x, y) dady with the order of integration reversed? Hint: Sketch the region and use it to reverse the order of integration O a) -I f(x, y) dydr -I O b ) -y f(x, y) dydr -1 Oc) f(x, y) dydr O d) f(x, y) dydr Oel Of) f(x, y) dydr