Same genus, different specific epithet?

Drosophila melanogaster and Drosophila simulans are fruit flies that are identical in appearance except for small differences in their genitalia. Hybrids can be produced, but they are sterile. On a basis of this information you can conclude that D. melanogaster and D. Simulans meet the criteria to be considered;
1. different biological species and different morphospecies
2 . different biological species but same morphospecies
3. same  biological species and different morphospecies
4 . same biological species and the same morphospecies