Item 4.2.2.d.
This cannot be a tree. The sum of the degrees is 28, so there are 14 edges. But there are 14 vertices as well, so we don't have \(v = e+1\text{,}\) meaning this cannot be a tree.
This cannot be a tree. The sum of the degrees is 28, so there are 14 edges. But there are 14 vertices as well, so we don't have \(v = e+1\text{,}\) meaning this cannot be a tree.