1) If $A \cup B$ = $A$, what can we conclude about the sets $A$ and $B$?

2) If $A \cap B = A$, what can we conclude about the sets $A$ and $B$?

So, for $(1)$ we can say $A = B$ or $B = \emptyset$

and for $(2)$ we can say $A = B$ only

right?