Copyright or trademark? If your son will be selling the invention as a product, he should consider acquiring a trademark registration for the name. As for copyright, he will acquire a copyright automatically for any copyrightable aspects of his invention. There's more on both topics in this book.
The correct answer is (d). Why the baby photo? (a) It signifies the 'birth' of your son's patent, (b) it signifies the new year (or new decade), (c) It's a sad attempt at search engine optimization ("cute baby, patent"), or (d) it was available in the free photo bin at istockphoto.com.