Based Upon the Following, What Is the Net ATP Production

Based upon the following, what is the net ATP production for the synthesis of one molecule of urea in the urea cycle? Consider that one nitrogen atom comes from glutamate dehydrogenase and the other comes from aspartate.
The conversion of fumarate to oxaloacetate gives 1 NADH (oxaloacetate is transaminated to aspartate)
Carbamoyl phosphate synthesis requires 2 ATP equivalents
Argininosuccinate synthesis requires 2 ATP equivalents
Glutamate dehydrogenase produces 1 NADH

A) -4 ATP
B) -1.5 ATP
C) -1 ATP
D) +1 ATP
E) +3 ATP