If you sort the elements in D alphabetically, you end up with
D = {a, b, c, d} = E
so right away we have
1. D ⊆ E is true
D is a subset of E because they are the same set, and any set is a subset of itself
2. D ⊂ E is false
Although D is a subset of E, D is not a proper subset of E because they contain the same elements. This would be true if E had any other elements.
3. E ⊆ D is true
4. E ⊂ D is false
5. D = E is true
We've already established at the start.
6. D ≠ E is false
