I am happy to say I got this right, but not so sure about the reason!
I didn't know the answer (so learned something here, and that's good), but worked it out from logic alone.
If #1 was true, then none of the others could be, and as the question states that there are two true statements, then #1 must be false.
If #2 was true, then so must #3 and #4, hence 3 true statements not 2. So #2 must be false.
Leaving #3 and #4 as the two true statements.
A good mental exercise, but not SQL:-)