The question asks which of the listed countries are members of the European Union.

Option 1 suggests that both Switzerland and Malta are EU members. While Malta is indeed an EU member having joined in 2004, Switzerland is not part of the European Union.

Option 2 suggests that Malta and Bulgaria are the EU members. This is correct, as Malta joined the EU in 2004 and Bulgaria followed in 2007.

Option 3 proposes that Switzerland and Bulgaria are the EU members. As mentioned before, Switzerland is not an EU member, so this cannot be correct.

Option 4 implies that all listed countries - Switzerland, Malta, and Bulgaria - are EU members. As discussed earlier, though Malta and Bulgaria are members of the EU, Switzerland is not.

Based on these breakdowns, the correct answer is indeed option 2. Malta and Bulgaria are the EU members from the given list, not Switzerland.